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-5(5a+8)=85
We move all terms to the left:
-5(5a+8)-(85)=0
We multiply parentheses
-25a-40-85=0
We add all the numbers together, and all the variables
-25a-125=0
We move all terms containing a to the left, all other terms to the right
-25a=125
a=125/-25
a=-5
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