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17=-13-8a
We move all terms to the left:
17-(-13-8a)=0
We add all the numbers together, and all the variables
-(-8a-13)+17=0
We get rid of parentheses
8a+13+17=0
We add all the numbers together, and all the variables
8a+30=0
We move all terms containing a to the left, all other terms to the right
8a=-30
a=-30/8
a=-3+3/4
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