30=-2(d+-7)

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Solution for 30=-2(d+-7) equation: 



30=-2(d+-7)

We move all terms to the left:

30-(-2(d+-7))=0

We add all the numbers together, and all the variables

-(-2(d-7))+30=0



We calculate terms in parentheses: -(-2(d-7)), so:

-2(d-7)

We multiply parentheses

-2d+14

Back to the equation:

-(-2d+14)



We get rid of parentheses

2d-14+30=0

We add all the numbers together, and all the variables

2d+16=0

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

2d=-16

d=-16/2

d=-8

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