20-2d=12

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Solution for 20-2d=12 equation: 



20-2d=12

We move all terms to the left:

20-2d-(12)=0

We add all the numbers together, and all the variables

-2d+8=0

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

-2d=-8

d=-8/-2

d=+4

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