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5y+16=10y+21=0
We move all terms to the left:
5y+16-(10y+21)=0
We get rid of parentheses
5y-10y-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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