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d^2+11d+30=(d+5)(d+0)
We move all terms to the left:
d^2+11d+30-((d+5)(d+0))=0
We add all the numbers together, and all the variables
d^2+11d-((d+5)(+d))+30=0
We multiply parentheses ..
d^2-((+d^2+5d))+11d+30=0
We calculate terms in parentheses: -((+d^2+5d)), so:We add all the numbers together, and all the variables
(+d^2+5d)
We get rid of parentheses
d^2+5d
Back to the equation:
-(d^2+5d)
d^2+11d-(d^2+5d)+30=0
We get rid of parentheses
d^2-d^2+11d-5d+30=0
We add all the numbers together, and all the variables
6d+30=0
We move all terms containing d to the left, all other terms to the right
6d=-30
d=-30/6
d=-5
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