6d+7=d+21

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Solution for 6d+7=d+21 equation: 



6d+7=d+21

We move all terms to the left:

6d+7-(d+21)=0

We get rid of parentheses

6d-d-21+7=0

We add all the numbers together, and all the variables

5d-14=0

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

5d=14

d=14/5

d=2+4/5

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