-13d-21=-21=-3(d+7)-10d

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Solution for -13d-21=-21=-3(d+7)-10d equation: 



-13d-21=-21=-3(d+7)-10d

We move all terms to the left:

-13d-21-(-21)=0

We add all the numbers together, and all the variables

-13d=0

d=0/-13

d=0

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