21+3=-9-3d

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Solution for 21+3=-9-3d equation: 



21+3=-9-3d

We move all terms to the left:

21+3-(-9-3d)=0

We add all the numbers together, and all the variables

-(-3d-9)+21+3=0

We add all the numbers together, and all the variables

-(-3d-9)+24=0

We get rid of parentheses

3d+9+24=0

We add all the numbers together, and all the variables

3d+33=0

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

3d=-33

d=-33/3

d=-11

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