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-152=-4(5a+8)
We move all terms to the left:
-152-(-4(5a+8))=0
We calculate terms in parentheses: -(-4(5a+8)), so:We get rid of parentheses
-4(5a+8)
We multiply parentheses
-20a-32
Back to the equation:
-(-20a-32)
20a+32-152=0
We add all the numbers together, and all the variables
20a-120=0
We move all terms containing a to the left, all other terms to the right
20a=120
a=120/20
a=6
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