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24=-4(a+4)
We move all terms to the left:
24-(-4(a+4))=0
We calculate terms in parentheses: -(-4(a+4)), so:We get rid of parentheses
-4(a+4)
We multiply parentheses
-4a-16
Back to the equation:
-(-4a-16)
4a+16+24=0
We add all the numbers together, and all the variables
4a+40=0
We move all terms containing a to the left, all other terms to the right
4a=-40
a=-40/4
a=-10
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