Odpowiedź:
a) 3x + 5 + 7 - 2x = x + 12
b) 5y + 7 - 2y + 12 = 3y + 19
c) 12 z - 20
d) 3x - 2y + 4
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Odpowiedź:
a) 3x + 5 + 7 - 2x = x + 12
b) 5y + 7 - 2y + 12 = 3y + 19
c) 12 z - 20
d) 3x - 2y + 4