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-8a-13=-4a
We move all terms to the left:
-8a-13-(-4a)=0
We get rid of parentheses
-8a+4a-13=0
We add all the numbers together, and all the variables
-4a-13=0
We move all terms containing a to the left, all other terms to the right
-4a=13
a=13/-4
a=-3+1/4
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