-9+2d=9+4d

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Solution for -9+2d=9+4d equation: 



-9+2d=9+4d

We move all terms to the left:

-9+2d-(9+4d)=0

We add all the numbers together, and all the variables

2d-(4d+9)-9=0

We get rid of parentheses

2d-4d-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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