20-d=-20+2d+1

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Solution for 20-d=-20+2d+1 equation: 



20-d=-20+2d+1

We move all terms to the left:

20-d-(-20+2d+1)=0

We add all the numbers together, and all the variables

-d-(2d-19)+20=0

We add all the numbers together, and all the variables

-1d-(2d-19)+20=0

We get rid of parentheses

-1d-2d+19+20=0

We add all the numbers together, and all the variables

-3d+39=0

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

-3d=-39

d=-39/-3

d=+13

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