-7d=-8-9d

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Solution for -7d=-8-9d equation: 



-7d=-8-9d

We move all terms to the left:

-7d-(-8-9d)=0

We add all the numbers together, and all the variables

-7d-(-9d-8)=0

We get rid of parentheses

-7d+9d+8=0

We add all the numbers together, and all the variables

2d+8=0

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

2d=-8

d=-8/2

d=-4

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