18d-21=3(5d+1)

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Solution for 18d-21=3(5d+1) equation: 



18d-21=3(5d+1)

We move all terms to the left:

18d-21-(3(5d+1))=0



We calculate terms in parentheses: -(3(5d+1)), so:

3(5d+1)

We multiply parentheses

15d+3

Back to the equation:

-(15d+3)



We get rid of parentheses

18d-15d-3-21=0

We add all the numbers together, and all the variables

3d-24=0

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

3d=24

d=24/3

d=8

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