20d-2=78

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Solution for 20d-2=78 equation: 



20d-2=78

We move all terms to the left:

20d-2-(78)=0

We add all the numbers together, and all the variables

20d-80=0

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

20d=80

d=80/20

d=4

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