129=7n-3(-6n+7)

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Solution for 129=7n-3(-6n+7) equation: 



129=7n-3(-6n+7)

We move all terms to the left:

129-(7n-3(-6n+7))=0



We calculate terms in parentheses: -(7n-3(-6n+7)), so:

7n-3(-6n+7)

We multiply parentheses

7n+18n-21

We add all the numbers together, and all the variables

25n-21

Back to the equation:

-(25n-21)



We get rid of parentheses

-25n+21+129=0

We add all the numbers together, and all the variables

-25n+150=0

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

-25n=-150

n=-150/-25

n=+6

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