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50=-2(-2y-5)
We move all terms to the left:
50-(-2(-2y-5))=0
We calculate terms in parentheses: -(-2(-2y-5)), so:We get rid of parentheses
-2(-2y-5)
We multiply parentheses
4y+10
Back to the equation:
-(4y+10)
-4y-10+50=0
We add all the numbers together, and all the variables
-4y+40=0
We move all terms containing y to the left, all other terms to the right
-4y=-40
y=-40/-4
y=+10
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