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-5(a-8)-(a-5)=15
We move all terms to the left:
-5(a-8)-(a-5)-(15)=0
We multiply parentheses
-5a-(a-5)+40-15=0
We get rid of parentheses
-5a-a+5+40-15=0
We add all the numbers together, and all the variables
-6a+30=0
We move all terms containing a to the left, all other terms to the right
-6a=-30
a=-30/-6
a=+5
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