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56=5(-6a-5)+7(1-a)
We move all terms to the left:
56-(5(-6a-5)+7(1-a))=0
We add all the numbers together, and all the variables
-(5(-6a-5)+7(-1a+1))+56=0
We calculate terms in parentheses: -(5(-6a-5)+7(-1a+1)), so:We get rid of parentheses
5(-6a-5)+7(-1a+1)
We multiply parentheses
-30a-7a-25+7
We add all the numbers together, and all the variables
-37a-18
Back to the equation:
-(-37a-18)
37a+18+56=0
We add all the numbers together, and all the variables
37a+74=0
We move all terms containing a to the left, all other terms to the right
37a=-74
a=-74/37
a=-2
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