20=-50+7d

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Solution for 20=-50+7d equation: 



20=-50+7d

We move all terms to the left:

20-(-50+7d)=0

We add all the numbers together, and all the variables

-(7d-50)+20=0

We get rid of parentheses

-7d+50+20=0

We add all the numbers together, and all the variables

-7d+70=0

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

-7d=-70

d=-70/-7

d=+10

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