7d-2d=-21

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Solution for 7d-2d=-21 equation: 



7d-2d=-21

We move all terms to the left:

7d-2d-(-21)=0

We add all the numbers together, and all the variables

5d+21=0

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

5d=-21

d=-21/5

d=-4+1/5

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