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5-8(6-a)=-91
We move all terms to the left:
5-8(6-a)-(-91)=0
We add all the numbers together, and all the variables
-8(-1a+6)+5-(-91)=0
We add all the numbers together, and all the variables
-8(-1a+6)+96=0
We multiply parentheses
8a-48+96=0
We add all the numbers together, and all the variables
8a+48=0
We move all terms containing a to the left, all other terms to the right
8a=-48
a=-48/8
a=-6
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