21=-2d+9

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Solution for 21=-2d+9 equation: 



21=-2d+9

We move all terms to the left:

21-(-2d+9)=0

We get rid of parentheses

2d-9+21=0

We add all the numbers together, and all the variables

2d+12=0

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

2d=-12

d=-12/2

d=-6

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