21=7(d-8)

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Solution for 21=7(d-8) equation:



21=7(d-8)
We move all terms to the left:
21-(7(d-8))=0
We calculate terms in parentheses: -(7(d-8)), so:
7(d-8)
We multiply parentheses
7d-56
Back to the equation:
-(7d-56)
We get rid of parentheses
-7d+56+21=0
We add all the numbers together, and all the variables
-7d+77=0
We move all terms containing d to the left, all other terms to the right
-7d=-77
d=-77/-7
d=+11

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