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y=-3y+18
We move all terms to the left:
y-(-3y+18)=0
We get rid of parentheses
y+3y-18=0
We add all the numbers together, and all the variables
4y-18=0
We move all terms containing y to the left, all other terms to the right
4y=18
y=18/4
y=4+1/2
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