20+20+20d=-20+15d

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



20+20+20d=-20+15d

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

20d-(15d-20)+40=0

We get rid of parentheses

20d-15d+20+40=0

We add all the numbers together, and all the variables

5d+60=0

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

5d=-60

d=-60/5

d=-12

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