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5a+13=-91-8a
We move all terms to the left:
5a+13-(-91-8a)=0
We add all the numbers together, and all the variables
5a-(-8a-91)+13=0
We get rid of parentheses
5a+8a+91+13=0
We add all the numbers together, and all the variables
13a+104=0
We move all terms containing a to the left, all other terms to the right
13a=-104
a=-104/13
a=-8
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