129=3(1-7x)

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Solution for 129=3(1-7x) equation: 



129=3(1-7x)

We move all terms to the left:

129-(3(1-7x))=0

We add all the numbers together, and all the variables

-(3(-7x+1))+129=0



We calculate terms in parentheses: -(3(-7x+1)), so:

3(-7x+1)

We multiply parentheses

-21x+3

Back to the equation:

-(-21x+3)



We get rid of parentheses

21x-3+129=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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