42=2(12+a)

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Solution for 42=2(12+a) equation: 



42=2(12+a)

We move all terms to the left:

42-(2(12+a))=0

We add all the numbers together, and all the variables

-(2(a+12))+42=0



We calculate terms in parentheses: -(2(a+12)), so:

2(a+12)

We multiply parentheses

2a+24

Back to the equation:

-(2a+24)



We get rid of parentheses

-2a-24+42=0

We add all the numbers together, and all the variables

-2a+18=0

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

-2a=-18

a=-18/-2

a=+9

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