9+x=5x+21

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Solution for 9+x=5x+21 equation: 



9+x=5x+21

We move all terms to the left:

9+x-(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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