42=3(7a-2)+3(a+8)

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Solution for 42=3(7a-2)+3(a+8) equation: 



42=3(7a-2)+3(a+8)

We move all terms to the left:

42-(3(7a-2)+3(a+8))=0



We calculate terms in parentheses: -(3(7a-2)+3(a+8)), so:

3(7a-2)+3(a+8)

We multiply parentheses

21a+3a-6+24

We add all the numbers together, and all the variables

24a+18

Back to the equation:

-(24a+18)



We get rid of parentheses

-24a-18+42=0

We add all the numbers together, and all the variables

-24a+24=0

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

-24a=-24

a=-24/-24

a=1

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