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Ta co´:
-4 ( 2x + 9 ) - ( -8x + 3 ) - ( x + 13 ) = 0
-8x - 36 + 8x -3 - x - 13 = 0
. ( -8x + 8x ) - 36 - 3 - x - 13 = 0
- 36 - 3 - x - 13 = 0
x = 0 + 36 + 3 + 13
x = 52
-4(2x+9)-(-8x+3)-(x+13)=0
-8x-36+8x-3-x-13=0
-x-52=0
-x=52
x=-52
-4.(2x+9)-(-8x+3)-(x+13)=0
=> 2x+9=0 hoặc -8x+3=0 hoặc x+13=0
TH1: 2x+9=0 =>x = -4,5
TH2: -8x+3=0=>x = 0,375
TH3: x+13=0=> x = -13
Vậy x=-4,5 hoặc x = 0,375 hoặc x = -13
\(a.\)
\(-18-x=-8+\left(13\right)\)
\(\Rightarrow-18-x=5\)
\(\Rightarrow x=-18-5=-23\)
\(b.\)
\(x-43=\left(57-x\right)-50\)
\(\Rightarrow x-43=57-x-50\)
\(\Rightarrow x+x=43+57-50\)
\(\Rightarrow2x=50\)
\(\Rightarrow x=25\)
\(c.\)
\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(\Rightarrow-8x-36+8x-3-x-13=0\)
\(\Rightarrow-x-52=0\)
\(\Rightarrow-x=52\)
\(\Rightarrow x=-52\)
-4.(2x+9)-(-8x+3)-(x+13)=0
(-4.2x+-4.9)+8.x-3-x+13=0
-8x+-36+8x-3-x+13=0
(8x-8x)-x=0+36+3-13
0-x=26
=>x thuộc rỗng
-2.(x+6)+6.(x-10)=8
(-2.x+2.6)+(6.x-6.10)=8
(-2+6).x+12-60=8
4.x=8+60-12
4.x=56
x=56:4
x=14
\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)
+ -2X-12+6X-60=8
<=>4X=80]
<=> X = 20
V.....
+ -8X-36 +8X -3 - X - 13 =0
<=> -X = 52
<=> X = -52
V.....
+ 14X +7\(X^2\)-7\(X^2\)-21X=14
<=> -7X =14
<=> X= -2
V .......
(2x - 7) + 17 = 6
=> 2x - 7 = 6 - 17
=> 2x - 7 = -11
=> 2x = -11 + 7
=> 2x = -4
=> x = -4 : 2
=> x = -2
+) 12 -2(3 - 3x)= -2
=> 2(3 - 3x) = 12 + 2
=> 2(3 - 3x) = 14
=> 3 - 3x = 14 : 2
=> 3 - 3x = 7
=> 3x = 3 - 7
=> 3x = -4
=> x = -4/3
\(\left(x+1\right)\left(x-3\right)=0\)
=> \(\orbr{\begin{cases}x+1=0\\x-3=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=-1\\x=3\end{cases}}\)
Vậy...
\(\Leftrightarrow-8x-36+8x-3-x-13=0\)
\(\Leftrightarrow-8x+8x-x=0+13+36+3\)
\(\Leftrightarrow-x=52\)
\(\Rightarrow x=-52\)
Vậy \(x=-52\)
-4. (2x + 9) - (-8x + 3) - (x + 13) = 0
-8x + (-36) - (-8x) - 3 - x - 13 = 0
-8x + (-36) + 8x + (-3) + (-x) + (-13) = 0
(-8x) + 8x + (-36) + (-3) + (-13) + (-x) = 0
(-52) + (-x) = 0
-x = 0 + 52
-x = 52
x = -52