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-9=-2y-21
We move all terms to the left:
-9-(-2y-21)=0
We get rid of parentheses
2y+21-9=0
We add all the numbers together, and all the variables
2y+12=0
We move all terms containing y to the left, all other terms to the right
2y=-12
y=-12/2
y=-6
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