20d-15=12

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Solution for 20d-15=12 equation: 



20d-15=12

We move all terms to the left:

20d-15-(12)=0

We add all the numbers together, and all the variables

20d-27=0

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

20d=27

d=27/20

d=1+7/20

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