-18+18d=d+19d+20

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Solution for -18+18d=d+19d+20 equation: 



-18+18d=d+19d+20

We move all terms to the left:

-18+18d-(d+19d+20)=0

We add all the numbers together, and all the variables

18d-(20d+20)-18=0

We get rid of parentheses

18d-20d-20-18=0

We add all the numbers together, and all the variables

-2d-38=0

We move all terms containing d to the left, all other terms to the right

-2d=38

d=38/-2

d=-19

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