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56=2(6-6a)+4(1+8a)
We move all terms to the left:
56-(2(6-6a)+4(1+8a))=0
We add all the numbers together, and all the variables
-(2(-6a+6)+4(8a+1))+56=0
We calculate terms in parentheses: -(2(-6a+6)+4(8a+1)), so:We get rid of parentheses
2(-6a+6)+4(8a+1)
We multiply parentheses
-12a+32a+12+4
We add all the numbers together, and all the variables
20a+16
Back to the equation:
-(20a+16)
-20a-16+56=0
We add all the numbers together, and all the variables
-20a+40=0
We move all terms containing a to the left, all other terms to the right
-20a=-40
a=-40/-20
a=+2
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