-3d=-90

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Solution for -3d=-90 equation: 



-3d=-90

We move all terms to the left:

-3d-(-90)=0

We add all the numbers together, and all the variables

-3d+90=0

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

-3d=-90

d=-90/-3

d=+30

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