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90=10y-10
We move all terms to the left:
90-(10y-10)=0
We get rid of parentheses
-10y+10+90=0
We add all the numbers together, and all the variables
-10y+100=0
We move all terms containing y to the left, all other terms to the right
-10y=-100
y=-100/-10
y=+10
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