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-113=7a+8(a-1)
We move all terms to the left:
-113-(7a+8(a-1))=0
We calculate terms in parentheses: -(7a+8(a-1)), so:We get rid of parentheses
7a+8(a-1)
We multiply parentheses
7a+8a-8
We add all the numbers together, and all the variables
15a-8
Back to the equation:
-(15a-8)
-15a+8-113=0
We add all the numbers together, and all the variables
-15a-105=0
We move all terms containing a to the left, all other terms to the right
-15a=105
a=105/-15
a=-7
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