20+5d=-20-15d

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Solution for 20+5d=-20-15d equation: 



20+5d=-20-15d

We move all terms to the left:

20+5d-(-20-15d)=0

We add all the numbers together, and all the variables

5d-(-15d-20)+20=0

We get rid of parentheses

5d+15d+20+20=0

We add all the numbers together, and all the variables

20d+40=0

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

20d=-40

d=-40/20

d=-2

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