138=3x-3(7x-10)

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Solution for 138=3x-3(7x-10) equation: 



138=3x-3(7x-10)

We move all terms to the left:

138-(3x-3(7x-10))=0



We calculate terms in parentheses: -(3x-3(7x-10)), so:

3x-3(7x-10)

We multiply parentheses

3x-21x+30

We add all the numbers together, and all the variables

-18x+30

Back to the equation:

-(-18x+30)



We get rid of parentheses

18x-30+138=0

We add all the numbers together, and all the variables

18x+108=0

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

18x=-108

x=-108/18

x=-6

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