d+90=3d-80

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Solution for d+90=3d-80 equation: 



d+90=3d-80

We move all terms to the left:

d+90-(3d-80)=0

We get rid of parentheses

d-3d+80+90=0

We add all the numbers together, and all the variables

-2d+170=0

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

-2d=-170

d=-170/-2

d=+85

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