-20-19d=19+20d

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Solution for -20-19d=19+20d equation: 



-20-19d=19+20d

We move all terms to the left:

-20-19d-(19+20d)=0

We add all the numbers together, and all the variables

-19d-(20d+19)-20=0

We get rid of parentheses

-19d-20d-19-20=0

We add all the numbers together, and all the variables

-39d-39=0

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

-39d=39

d=39/-39

d=-1

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