-6d+9=21

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Solution for -6d+9=21 equation: 



-6d+9=21

We move all terms to the left:

-6d+9-(21)=0

We add all the numbers together, and all the variables

-6d-12=0

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

-6d=12

d=12/-6

d=-2

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