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100=9(d+2)+1
We move all terms to the left:
100-(9(d+2)+1)=0
We calculate terms in parentheses: -(9(d+2)+1), so:We get rid of parentheses
9(d+2)+1
We multiply parentheses
9d+18+1
We add all the numbers together, and all the variables
9d+19
Back to the equation:
-(9d+19)
-9d-19+100=0
We add all the numbers together, and all the variables
-9d+81=0
We move all terms containing d to the left, all other terms to the right
-9d=-81
d=-81/-9
d=+9
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