120 + (3x + 34) . 2 - (7 + x) = 186
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1)120 + ( 34 + 3x ) - ( 6 + x ) = 0
=> 120 + 34 + 3x - 6 - x = 0
=> ( 120 + 34 - 6 ) + ( 3x - x ) = 0
=> 148 + 2x = 0
=> - 2x = 148 => x = 148 : ( - 2 )
=> x = -74
Vậy x = - 74
2)\(\dfrac{-5}{6}-x=\dfrac{7}{12}+\left(\dfrac{-1}{3}\right)\)
\(=>x=\dfrac{-5}{6}-\left(\dfrac{7}{12}-\dfrac{1}{3}\right)\)
\(=>x=\dfrac{-5}{6}-\dfrac{7}{12}+\dfrac{1}{3}\)
\(=>x=\dfrac{-10}{12}-\dfrac{7}{12}+\dfrac{4}{12}\)
\(=>x=\dfrac{-10-7+4}{12}=\dfrac{-13}{12}\)
Vậy x = \(\dfrac{-13}{12}\)
tick cho mk nha
1) 3x = 45 + 15 = 60
x = 60 : 3 = 20
2) 5x = 50 - 35 = 15
x = 15 : 5 = 3
3) (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
4) 10 - 2(4 -3x) = -4
2(4 - 3x) = -4 - 10 = -14
4 - 3x = -14 : 2 = -7
3x = -7 - 4 = -18
x = -18 : 3 = -6
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
5) - 12 + 3(-x + 7) = -18
3(-x+7) = -18- -12
3(-x+7) = -30
-x+7 = -30 : 3
-x+7 = -10
-x = -10 -7 = -17
Vậy x= 17
6) 24 : (3x – 2) = -3
( 3x - 2) = 24: -3
3x - 2 = -8
3x = -8 +2
3x = -6
x = -6:3 = -2
Vậy x= -2
7) -45 : 5.(-3 – 2x) = 3
5(-3-2x) = -45: 3
5( -3-2x) = -15
-3-2x = -15 :5
-3- 2x = -3
2x = -3--3
2x= 0
Vậy x= 0
(3x + 34) - ( 7 + x ) = 186 - 120
3x + 34 - 7 - x = 66
2x + 27 = 66
2x = 66 - 27
2x = 39
x = 39 : 2
x = 19,5