d-2d=-d

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Solution for d-2d=-d equation: 



d-2d=-d

We move all terms to the left:

d-2d-(-d)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1d-(-1d)=0

We get rid of parentheses

-1d+1d=0

We add all the numbers together, and all the variables

=0

d=0/1

d=0

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