13x-129=81-7x

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Solution for 13x-129=81-7x equation: 



13x-129=81-7x

We move all terms to the left:

13x-129-(81-7x)=0

We add all the numbers together, and all the variables

13x-(-7x+81)-129=0

We get rid of parentheses

13x+7x-81-129=0

We add all the numbers together, and all the variables

20x-210=0

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

20x=210

x=210/20

x=10+1/2

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