-20+d-20=20-19d

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



-20+d-20=20-19d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

d-(-19d+20)-40=0

We get rid of parentheses

d+19d-20-40=0

We add all the numbers together, and all the variables

20d-60=0

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

20d=60

d=60/20

d=3

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