9=4x-7x

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Solution for 9=4x-7x equation: 



9=4x-7x

We move all terms to the left:

9-(4x-7x)=0

We add all the numbers together, and all the variables

-(-3x)+9=0

We get rid of parentheses

3x+9=0

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

3x=-9

x=-9/3

x=-3

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