Ответ:
1) -15+3y -2y+8=2-7y+7
3y-2y+7y=2+7+15
8y=24
y=3
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Ответ:
1) -15+3y -2y+8=2-7y+7
3y-2y+7y=2+7+15
8y=24
y=3