21d+25=15d+109

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Solution for 21d+25=15d+109 equation: 



21d+25=15d+109

We move all terms to the left:

21d+25-(15d+109)=0

We get rid of parentheses

21d-15d-109+25=0

We add all the numbers together, and all the variables

6d-84=0

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

6d=84

d=84/6

d=14

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