-4d+3d-(-9d)-20d-(-15d)=-15

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Solution for -4d+3d-(-9d)-20d-(-15d)=-15 equation: 



-4d+3d-(-9d)-20d-(-15d)=-15

We move all terms to the left:

-4d+3d-(-9d)-20d-(-15d)-(-15)=0

We add all the numbers together, and all the variables

-21d-(-9d)-(-15d)+15=0

We get rid of parentheses

-21d+9d+15d+15=0

We add all the numbers together, and all the variables

3d+15=0

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

3d=-15

d=-15/3

d=-5

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