42=3(2d-12)

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Solution for 42=3(2d-12) equation: 



42=3(2d-12)

We move all terms to the left:

42-(3(2d-12))=0



We calculate terms in parentheses: -(3(2d-12)), so:

3(2d-12)

We multiply parentheses

6d-36

Back to the equation:

-(6d-36)



We get rid of parentheses

-6d+36+42=0

We add all the numbers together, and all the variables

-6d+78=0

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

-6d=-78

d=-78/-6

d=+13

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