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-2(-3+18)=7y+2y
We move all terms to the left:
-2(-3+18)-(7y+2y)=0
We add all the numbers together, and all the variables
-(+9y)-215=0
We get rid of parentheses
-9y-215=0
We move all terms containing y to the left, all other terms to the right
-9y=215
y=215/-9
y=-23+8/9
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