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3(-y+3)+y=-3
We move all terms to the left:
3(-y+3)+y-(-3)=0
We add all the numbers together, and all the variables
3(-1y+3)+y-(-3)=0
We add all the numbers together, and all the variables
y+3(-1y+3)+3=0
We multiply parentheses
y-3y+9+3=0
We add all the numbers together, and all the variables
-2y+12=0
We move all terms containing y to the left, all other terms to the right
-2y=-12
y=-12/-2
y=+6
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