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-8y+16=-3y+21
We move all terms to the left:
-8y+16-(-3y+21)=0
We get rid of parentheses
-8y+3y-21+16=0
We add all the numbers together, and all the variables
-5y-5=0
We move all terms containing y to the left, all other terms to the right
-5y=5
y=5/-5
y=-1
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