-42=3(-2+4a)

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Solution for -42=3(-2+4a) equation: 



-42=3(-2+4a)

We move all terms to the left:

-42-(3(-2+4a))=0

We add all the numbers together, and all the variables

-(3(4a-2))-42=0



We calculate terms in parentheses: -(3(4a-2)), so:

3(4a-2)

We multiply parentheses

12a-6

Back to the equation:

-(12a-6)



We get rid of parentheses

-12a+6-42=0

We add all the numbers together, and all the variables

-12a-36=0

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

-12a=36

a=36/-12

a=-3

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