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61=4a-9
We move all terms to the left:
61-(4a-9)=0
We get rid of parentheses
-4a+9+61=0
We add all the numbers together, and all the variables
-4a+70=0
We move all terms containing a to the left, all other terms to the right
-4a=-70
a=-70/-4
a=17+1/2
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