13d+23d-25d+7=84

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Solution for 13d+23d-25d+7=84 equation: 



13d+23d-25d+7=84

We move all terms to the left:

13d+23d-25d+7-(84)=0

We add all the numbers together, and all the variables

11d-77=0

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

11d=77

d=77/11

d=7

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