4x-30=x-9

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Solution for 4x-30=x-9 equation: 



4x-30=x-9

We move all terms to the left:

4x-30-(x-9)=0

We get rid of parentheses

4x-x+9-30=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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