7d-3d-5=-21

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Solution for 7d-3d-5=-21 equation: 



7d-3d-5=-21

We move all terms to the left:

7d-3d-5-(-21)=0

We add all the numbers together, and all the variables

4d+16=0

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

4d=-16

d=-16/4

d=-4

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