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9a+31=4a+24
We move all terms to the left:
9a+31-(4a+24)=0
We get rid of parentheses
9a-4a-24+31=0
We add all the numbers together, and all the variables
5a+7=0
We move all terms containing a to the left, all other terms to the right
5a=-7
a=-7/5
a=-1+2/5
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