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-8a+5(-5+2a)=6a-13
We move all terms to the left:
-8a+5(-5+2a)-(6a-13)=0
We add all the numbers together, and all the variables
-8a+5(2a-5)-(6a-13)=0
We multiply parentheses
-8a+10a-(6a-13)-25=0
We get rid of parentheses
-8a+10a-6a+13-25=0
We add all the numbers together, and all the variables
-4a-12=0
We move all terms containing a to the left, all other terms to the right
-4a=12
a=12/-4
a=-3
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