3+7x=-7x+129

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



3+7x=-7x+129

We move all terms to the left:

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

We get rid of parentheses

7x+7x-129+3=0

We add all the numbers together, and all the variables

14x-126=0

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

14x=126

x=126/14

x=9

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