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-112=-7(7-3a)
We move all terms to the left:
-112-(-7(7-3a))=0
We add all the numbers together, and all the variables
-(-7(-3a+7))-112=0
We calculate terms in parentheses: -(-7(-3a+7)), so:We get rid of parentheses
-7(-3a+7)
We multiply parentheses
21a-49
Back to the equation:
-(21a-49)
-21a+49-112=0
We add all the numbers together, and all the variables
-21a-63=0
We move all terms containing a to the left, all other terms to the right
-21a=63
a=63/-21
a=-3
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