(-2d)+9=21

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Solution for (-2d)+9=21 equation: 



(-2d)+9=21

We move all terms to the left:

(-2d)+9-(21)=0

We add all the numbers together, and all the variables

(-2d)-12=0

We get rid of parentheses

-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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