12+3(y+3)=27
15+3+y=27
18+y=27
y=27-18
y=9
12+3(9+3)=27
27=27
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12+3(y+3)=27
15+3+y=27
18+y=27
y=27-18
y=9
12+3(9+3)=27
27=27
15у+45=27
15у=27-45
15у=18
у=18/15
у=6/5