X-9=5x-21

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



X-9=5X-21

We move all terms to the left:

X-9-(5X-21)=0

We get rid of parentheses

X-5X+21-9=0

We add all the numbers together, and all the variables

-4X+12=0

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

-4X=-12

X=-12/-4

X=+3

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