3x-9=4x-9

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Solution for 3x-9=4x-9 equation: 



3x-9=4x-9

We move all terms to the left:

3x-9-(4x-9)=0

We get rid of parentheses

3x-4x+9-9=0

We add all the numbers together, and all the variables

-x=0

x=0/-1

x=0

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