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-20=a/(-4)
We move all terms to the left:
-20-(a/(-4))=0
We multiply all the terms by the denominator
-(a-20*(-4))=0
We calculate terms in parentheses: -(a-20*(-4)), so:We get rid of parentheses
a-20*(-4)
We add all the numbers together, and all the variables
a+80
Back to the equation:
-(a+80)
-a-80=0
We add all the numbers together, and all the variables
-1a-80=0
We move all terms containing a to the left, all other terms to the right
-a=80
a=80/-1
a=-80
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