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130=8a+17
We move all terms to the left:
130-(8a+17)=0
We get rid of parentheses
-8a-17+130=0
We add all the numbers together, and all the variables
-8a+113=0
We move all terms containing a to the left, all other terms to the right
-8a=-113
a=-113/-8
a=14+1/8
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