5+(7y-12)/3=y+13 |*3
15+7y-12=3y+39
3+7y=3y+39
7y-3y=39-3
4y=36
y=36:4
y=9
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5+(7y-12)/3=y+13 |*3
15+7y-12=3y+39
3+7y=3y+39
7y-3y=39-3
4y=36
y=36:4
y=9