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8=2y.y
We move all terms to the left:
8-(2y.y)=0
We add all the numbers together, and all the variables
-(+2y.y)+8=0
We get rid of parentheses
-2y.y+8=0
We move all terms containing y to the left, all other terms to the right
-2y.y=-8
y=-8/1
y=-8
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