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a) x + 25 = 53
x = 53 - 25
x = 28
b) x - 56 = 28
x = 28 + 56
x = 84
c) 56 - x = 17
x = 56 - 17
x = 39
d) 22 - x = 16
x = 22 - 16
x = 6
x + 25 = 53
x= 53 - 25
x = 28
x - 56 = 28
x = 28 + 56
x = 84
56 - x = 17
x = 56 - 17
x = 39
22 - x = 16
x = 22 - 16
x = 6
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a. 113 + 142 + x = 999 – 103
255 + x = 896
x = 896 – 255
x = 641
b. x – 124 = 400 + 56
x – 124 = 456
x = 456 + 124
x = 580
c. 963 – x = 869 – 28 : 4
963 – x = 869 – 7
963 – x = 862
x = 963 – 862
x = 101
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Phần đầu mình không biết
x= 78-56
x= 22
x= 56-56
x=0
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A)x+12=12+6
x=18-12
x=6
b)x-21=33-21
x=12+21
x=33
c)14-x=14-2
x=16-14
x=2
d)x-48=65-28
x=37+48
x=85
e)65-x=48+17
x=65-65
x=0
a,x+12=12+6
x+12=18
x=18-12
x=6
b, x-21=33-21
x-21=12
x=12+21
x=33
c, 14-x=14-2
14-x=12
x=14-12
x=2
d,x-48=65-28
x-48=37
x=37+48
x=85
e,65-x=48+17
65-x =65
x=65-65
x=0
x - 28 = 56
x = 56 + 28
x = 84
Ta có:\(x-28=56\)
\(x=56+28\)
\(x=84\)