21+3d=-2

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Solution for 21+3d=-2 equation: 



21+3d=-2

We move all terms to the left:

21+3d-(-2)=0

We add all the numbers together, and all the variables

3d+23=0

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

3d=-23

d=-23/3

d=-7+2/3

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