9+19d=20d-1

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Solution for 9+19d=20d-1 equation: 



9+19d=20d-1

We move all terms to the left:

9+19d-(20d-1)=0

We get rid of parentheses

19d-20d+1+9=0

We add all the numbers together, and all the variables

-1d+10=0

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

-d=-10

d=-10/-1

d=+10

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