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17=5+3a+a
We move all terms to the left:
17-(5+3a+a)=0
We add all the numbers together, and all the variables
-(4a+5)+17=0
We get rid of parentheses
-4a-5+17=0
We add all the numbers together, and all the variables
-4a+12=0
We move all terms containing a to the left, all other terms to the right
-4a=-12
a=-12/-4
a=+3
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