-d+9=-3d-9

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



-d+9=-3d-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1d-(-3d-9)+9=0

We get rid of parentheses

-1d+3d+9+9=0

We add all the numbers together, and all the variables

2d+18=0

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

2d=-18

d=-18/2

d=-9

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