21-5x=9=9x

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



21-5x=9=9x

We move all terms to the left:

21-5x-(9)=0

We add all the numbers together, and all the variables

-5x+12=0

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

-5x=-12

x=-12/-5

x=2+2/5

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