15+4d=9d-20

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Solution for 15+4d=9d-20 equation: 



15+4d=9d-20

We move all terms to the left:

15+4d-(9d-20)=0

We get rid of parentheses

4d-9d+20+15=0

We add all the numbers together, and all the variables

-5d+35=0

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

-5d=-35

d=-35/-5

d=+7

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