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111=2a+3(2a+5)
We move all terms to the left:
111-(2a+3(2a+5))=0
We calculate terms in parentheses: -(2a+3(2a+5)), so:We get rid of parentheses
2a+3(2a+5)
We multiply parentheses
2a+6a+15
We add all the numbers together, and all the variables
8a+15
Back to the equation:
-(8a+15)
-8a-15+111=0
We add all the numbers together, and all the variables
-8a+96=0
We move all terms containing a to the left, all other terms to the right
-8a=-96
a=-96/-8
a=+12
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