-90=3(-2d-8)

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Solution for -90=3(-2d-8) equation: 



-90=3(-2d-8)

We move all terms to the left:

-90-(3(-2d-8))=0



We calculate terms in parentheses: -(3(-2d-8)), so:

3(-2d-8)

We multiply parentheses

-6d-24

Back to the equation:

-(-6d-24)



We get rid of parentheses

6d+24-90=0

We add all the numbers together, and all the variables

6d-66=0

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

6d=66

d=66/6

d=11

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