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a+(a+17)=117
We move all terms to the left:
a+(a+17)-(117)=0
We get rid of parentheses
a+a+17-117=0
We add all the numbers together, and all the variables
2a-100=0
We move all terms containing a to the left, all other terms to the right
2a=100
a=100/2
a=50
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