7-x-3x=9

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



7-x-3x=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-4x-2=0

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

-4x=2

x=2/-4

x=-1/2

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