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5(-2a-8)=-9a+4
We move all terms to the left:
5(-2a-8)-(-9a+4)=0
We multiply parentheses
-10a-(-9a+4)-40=0
We get rid of parentheses
-10a+9a-4-40=0
We add all the numbers together, and all the variables
-1a-44=0
We move all terms containing a to the left, all other terms to the right
-a=44
a=44/-1
a=-44
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