-21+7d=14

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Solution for -21+7d=14 equation: 



-21+7d=14

We move all terms to the left:

-21+7d-(14)=0

We add all the numbers together, and all the variables

7d-35=0

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

7d=35

d=35/7

d=5

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