d+20=2d+12

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Solution for d+20=2d+12 equation: 



d+20=2d+12

We move all terms to the left:

d+20-(2d+12)=0

We get rid of parentheses

d-2d-12+20=0

We add all the numbers together, and all the variables

-1d+8=0

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

-d=-8

d=-8/-1

d=+8

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