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2(-2y+4)-y=-12
We move all terms to the left:
2(-2y+4)-y-(-12)=0
We add all the numbers together, and all the variables
-1y+2(-2y+4)+12=0
We multiply parentheses
-1y-4y+8+12=0
We add all the numbers together, and all the variables
-5y+20=0
We move all terms containing y to the left, all other terms to the right
-5y=-20
y=-20/-5
y=+4
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