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21=7(a-5)
We move all terms to the left:
21-(7(a-5))=0
We calculate terms in parentheses: -(7(a-5)), so:We get rid of parentheses
7(a-5)
We multiply parentheses
7a-35
Back to the equation:
-(7a-35)
-7a+35+21=0
We add all the numbers together, and all the variables
-7a+56=0
We move all terms containing a to the left, all other terms to the right
-7a=-56
a=-56/-7
a=+8
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