3x-7=4x=9

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Solution for 3x-7=4x=9 equation: 



3x-7=4x=9

We move all terms to the left:

3x-7-(4x)=0

We add all the numbers together, and all the variables

-1x-7=0

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

-x=7

x=7/-1

x=-7

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