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432=-8(7a+2)
We move all terms to the left:
432-(-8(7a+2))=0
We calculate terms in parentheses: -(-8(7a+2)), so:We get rid of parentheses
-8(7a+2)
We multiply parentheses
-56a-16
Back to the equation:
-(-56a-16)
56a+16+432=0
We add all the numbers together, and all the variables
56a+448=0
We move all terms containing a to the left, all other terms to the right
56a=-448
a=-448/56
a=-8
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