-3d+21=6

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Solution for -3d+21=6 equation: 



-3d+21=6

We move all terms to the left:

-3d+21-(6)=0

We add all the numbers together, and all the variables

-3d+15=0

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

-3d=-15

d=-15/-3

d=+5

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