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-91=7(-4+a)
We move all terms to the left:
-91-(7(-4+a))=0
We add all the numbers together, and all the variables
-(7(a-4))-91=0
We calculate terms in parentheses: -(7(a-4)), so:We get rid of parentheses
7(a-4)
We multiply parentheses
7a-28
Back to the equation:
-(7a-28)
-7a+28-91=0
We add all the numbers together, and all the variables
-7a-63=0
We move all terms containing a to the left, all other terms to the right
-7a=63
a=63/-7
a=-9
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