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-6(a+8)=90
We move all terms to the left:
-6(a+8)-(90)=0
We multiply parentheses
-6a-48-90=0
We add all the numbers together, and all the variables
-6a-138=0
We move all terms containing a to the left, all other terms to the right
-6a=138
a=138/-6
a=-23
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