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(4x+3) + (3x+5) = (2x+6) + (2x+7)
4x+3x -2x -2x = 6 + 7 - 3 - 5
3x= 5
x= 5/3
b)
(34x+29) - (15x+38) = (39x+78) - (28x+15)
34x-15x - 39x + 28x =78 - 15 - 29 + 38
62x -54x = 116 - 44
8x = 72
x= 9
c)
(97y+58) - (73y+75) = (48y+83) - (31y+16)
97y -73y -48y + 31y= 83 -16 - 58 +75
128y - 121y= 158 - 74
7y = 84
y=12
7x+8=4x+13/-4x
3x+8=13/-8
3x=5/:3
x=5/3
b) 34x+29-15x-38=39x+78-28x-15
19x-9=11x+63/-11x
8x-9=63/+9
8x=72/:8
x=9
c)97y+58-73y-75=48y+83-31y-16
24y-17=17y+67/-17y
7y-17=67/+17
7y=84/:7
y=12