3x+18=x-18

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Solution for 3x+18=x-18 equation: 



3x+18=x-18

We move all terms to the left:

3x+18-(x-18)=0

We get rid of parentheses

3x-x+18+18=0

We add all the numbers together, and all the variables

2x+36=0

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

2x=-36

x=-36/2

x=-18

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