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-5-5(3a-8)=-85
We move all terms to the left:
-5-5(3a-8)-(-85)=0
We add all the numbers together, and all the variables
-5(3a-8)+80=0
We multiply parentheses
-15a+40+80=0
We add all the numbers together, and all the variables
-15a+120=0
We move all terms containing a to the left, all other terms to the right
-15a=-120
a=-120/-15
a=+8
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