90=3d+21

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Solution for 90=3d+21 equation: 



90=3d+21

We move all terms to the left:

90-(3d+21)=0

We get rid of parentheses

-3d-21+90=0

We add all the numbers together, and all the variables

-3d+69=0

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

-3d=-69

d=-69/-3

d=+23

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