-15=3(20-d)-2d

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Solution for -15=3(20-d)-2d equation: 



-15=3(20-d)-2d

We move all terms to the left:

-15-(3(20-d)-2d)=0

We add all the numbers together, and all the variables

-(3(-1d+20)-2d)-15=0



We calculate terms in parentheses: -(3(-1d+20)-2d), so:

3(-1d+20)-2d

We add all the numbers together, and all the variables

-2d+3(-1d+20)

We multiply parentheses

-2d-3d+60

We add all the numbers together, and all the variables

-5d+60

Back to the equation:

-(-5d+60)



We get rid of parentheses

5d-60-15=0

We add all the numbers together, and all the variables

5d-75=0

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

5d=75

d=75/5

d=15

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