7x+3(x-7)=129

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



7x+3(x-7)=129

We move all terms to the left:

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

We multiply parentheses

7x+3x-21-129=0

We add all the numbers together, and all the variables

10x-150=0

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

10x=150

x=150/10

x=15

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