40-2d=4d-20

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Solution for 40-2d=4d-20 equation: 



40-2d=4d-20

We move all terms to the left:

40-2d-(4d-20)=0

We get rid of parentheses

-2d-4d+20+40=0

We add all the numbers together, and all the variables

-6d+60=0

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

-6d=-60

d=-60/-6

d=+10

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