20=15-d

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Solution for 20=15-d equation: 



20=15-d

We move all terms to the left:

20-(15-d)=0

We add all the numbers together, and all the variables

-(-1d+15)+20=0

We get rid of parentheses

1d-15+20=0

We add all the numbers together, and all the variables

d+5=0

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

d=-5

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