Odpowiedź: a)
(4x+3)+(3x+5)=(2x+6)+(2x+7)
4x+3+3x+5 = 2x+6+2x+7
4x+3x-2x-2x = 6+7-3-5
3x = 5 /:3
x = 5/3
x = 1 2/3
b)
(34x+29)-(15x+38)=(39x+78)-(28x+15)
34x+29-15x-38 = 39x+78-28x-15
34x-15x-39x+28x = 78-15-29+38
8x = 72 /:8
x = 9
c)
(97y+58)-(73y+75)=(48y+83)-(31y+16)
97y+58-73y-75 = 48y+83-31y-16
97y-73y-48y+31y = 83-16-58+75
7y = 84 /:7
y = 12
d)
(39x-27)-(25x-48)=(34x-17)-(23x-62)
39x-27-25x+48 = 34x-17-23x+62
39x-25x-34x+23x = -17+62+27-48
3x = 24 /:3
x = 8
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