12=20-4d

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Solution for 12=20-4d equation: 



12=20-4d

We move all terms to the left:

12-(20-4d)=0

We add all the numbers together, and all the variables

-(-4d+20)+12=0

We get rid of parentheses

4d-20+12=0

We add all the numbers together, and all the variables

4d-8=0

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

4d=8

d=8/4

d=2

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