3x+(-x)=9+x-x

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Solution for 3x+(-x)=9+x-x equation: 



3x+(-x)=9+x-x

We move all terms to the left:

3x+(-x)-(9+x-x)=0

We add all the numbers together, and all the variables

3x+(-1x)-9=0

We get rid of parentheses

3x-1x-9=0

We add all the numbers together, and all the variables

2x-9=0

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

2x=9

x=9/2

x=4+1/2

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