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10a=-(7a+408)
We move all terms to the left:
10a-(-(7a+408))=0
We calculate terms in parentheses: -(-(7a+408)), so:We get rid of parentheses
-(7a+408)
We get rid of parentheses
-7a-408
Back to the equation:
-(-7a-408)
10a+7a+408=0
We add all the numbers together, and all the variables
17a+408=0
We move all terms containing a to the left, all other terms to the right
17a=-408
a=-408/17
a=-24
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