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9a+10=2a+80
We move all terms to the left:
9a+10-(2a+80)=0
We get rid of parentheses
9a-2a-80+10=0
We add all the numbers together, and all the variables
7a-70=0
We move all terms containing a to the left, all other terms to the right
7a=70
a=70/7
a=10
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