15+9d=-2(5d+4)

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Solution for 15+9d=-2(5d+4) equation: 



15+9d=-2(5d+4)

We move all terms to the left:

15+9d-(-2(5d+4))=0



We calculate terms in parentheses: -(-2(5d+4)), so:

-2(5d+4)

We multiply parentheses

-10d-8

Back to the equation:

-(-10d-8)



We get rid of parentheses

9d+10d+8+15=0

We add all the numbers together, and all the variables

19d+23=0

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

19d=-23

d=-23/19

d=-1+4/19

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