138=3(4-6a)

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Solution for 138=3(4-6a) equation: 



138=3(4-6a)

We move all terms to the left:

138-(3(4-6a))=0

We add all the numbers together, and all the variables

-(3(-6a+4))+138=0



We calculate terms in parentheses: -(3(-6a+4)), so:

3(-6a+4)

We multiply parentheses

-18a+12

Back to the equation:

-(-18a+12)



We get rid of parentheses

18a-12+138=0

We add all the numbers together, and all the variables

18a+126=0

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

18a=-126

a=-126/18

a=-7

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