30d=40(d-2)

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Solution for 30d=40(d-2) equation: 



30d=40(d-2)

We move all terms to the left:

30d-(40(d-2))=0



We calculate terms in parentheses: -(40(d-2)), so:

40(d-2)

We multiply parentheses

40d-80

Back to the equation:

-(40d-80)



We get rid of parentheses

30d-40d+80=0

We add all the numbers together, and all the variables

-10d+80=0

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

-10d=-80

d=-80/-10

d=+8

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