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-7-3(a-8)=-18-8a
We move all terms to the left:
-7-3(a-8)-(-18-8a)=0
We add all the numbers together, and all the variables
-3(a-8)-(-8a-18)-7=0
We multiply parentheses
-3a-(-8a-18)+24-7=0
We get rid of parentheses
-3a+8a+18+24-7=0
We add all the numbers together, and all the variables
5a+35=0
We move all terms containing a to the left, all other terms to the right
5a=-35
a=-35/5
a=-7
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