4x-9-x=5x-21

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Solution for 4x-9-x=5x-21 equation: 



4x-9-x=5x-21

We move all terms to the left:

4x-9-x-(5x-21)=0

We add all the numbers together, and all the variables

3x-(5x-21)-9=0

We get rid of parentheses

3x-5x+21-9=0

We add all the numbers together, and all the variables

-2x+12=0

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

-2x=-12

x=-12/-2

x=+6

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