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91=7(d+8)
We move all terms to the left:
91-(7(d+8))=0
We calculate terms in parentheses: -(7(d+8)), so:We get rid of parentheses
7(d+8)
We multiply parentheses
7d+56
Back to the equation:
-(7d+56)
-7d-56+91=0
We add all the numbers together, and all the variables
-7d+35=0
We move all terms containing d to the left, all other terms to the right
-7d=-35
d=-35/-7
d=+5
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