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-245=7(1+6a)
We move all terms to the left:
-245-(7(1+6a))=0
We add all the numbers together, and all the variables
-(7(6a+1))-245=0
We calculate terms in parentheses: -(7(6a+1)), so:We get rid of parentheses
7(6a+1)
We multiply parentheses
42a+7
Back to the equation:
-(42a+7)
-42a-7-245=0
We add all the numbers together, and all the variables
-42a-252=0
We move all terms containing a to the left, all other terms to the right
-42a=252
a=252/-42
a=-6
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