13d+3=4d+21

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Solution for 13d+3=4d+21 equation: 



13d+3=4d+21

We move all terms to the left:

13d+3-(4d+21)=0

We get rid of parentheses

13d-4d-21+3=0

We add all the numbers together, and all the variables

9d-18=0

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

9d=18

d=18/9

d=2

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