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-5(y+21)=40
We move all terms to the left:
-5(y+21)-(40)=0
We multiply parentheses
-5y-105-40=0
We add all the numbers together, and all the variables
-5y-145=0
We move all terms containing y to the left, all other terms to the right
-5y=145
y=145/-5
y=-29
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