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-2(-4+2y)=40
We move all terms to the left:
-2(-4+2y)-(40)=0
We add all the numbers together, and all the variables
-2(2y-4)-40=0
We multiply parentheses
-4y+8-40=0
We add all the numbers together, and all the variables
-4y-32=0
We move all terms containing y to the left, all other terms to the right
-4y=32
y=32/-4
y=-8
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