138=3(4+7x)

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Solution for 138=3(4+7x) equation: 



138=3(4+7x)

We move all terms to the left:

138-(3(4+7x))=0

We add all the numbers together, and all the variables

-(3(7x+4))+138=0



We calculate terms in parentheses: -(3(7x+4)), so:

3(7x+4)

We multiply parentheses

21x+12

Back to the equation:

-(21x+12)



We get rid of parentheses

-21x-12+138=0

We add all the numbers together, and all the variables

-21x+126=0

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

-21x=-126

x=-126/-21

x=+6

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