80-2d=50

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Solution for 80-2d=50 equation: 



80-2d=50

We move all terms to the left:

80-2d-(50)=0

We add all the numbers together, and all the variables

-2d+30=0

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

-2d=-30

d=-30/-2

d=+15

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