19+2d=81

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Solution for 19+2d=81 equation: 



19+2d=81

We move all terms to the left:

19+2d-(81)=0

We add all the numbers together, and all the variables

2d-62=0

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

2d=62

d=62/2

d=31

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