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7y+5(3-2y)=18
We move all terms to the left:
7y+5(3-2y)-(18)=0
We add all the numbers together, and all the variables
7y+5(-2y+3)-18=0
We multiply parentheses
7y-10y+15-18=0
We add all the numbers together, and all the variables
-3y-3=0
We move all terms containing y to the left, all other terms to the right
-3y=3
y=3/-3
y=-1
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