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7(y+3)-4(2y-6)=111
We move all terms to the left:
7(y+3)-4(2y-6)-(111)=0
We multiply parentheses
7y-8y+21+24-111=0
We add all the numbers together, and all the variables
-1y-66=0
We move all terms containing y to the left, all other terms to the right
-y=66
y=66/-1
y=-66
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