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-10a+237=-4a+117
We move all terms to the left:
-10a+237-(-4a+117)=0
We get rid of parentheses
-10a+4a-117+237=0
We add all the numbers together, and all the variables
-6a+120=0
We move all terms containing a to the left, all other terms to the right
-6a=-120
a=-120/-6
a=+20
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