-7d=-9d-4

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Solution for -7d=-9d-4 equation: 



-7d=-9d-4

We move all terms to the left:

-7d-(-9d-4)=0

We get rid of parentheses

-7d+9d+4=0

We add all the numbers together, and all the variables

2d+4=0

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

2d=-4

d=-4/2

d=-2

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