21-7x=9

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Solution for 21-7x=9 equation: 



21-7x=9

We move all terms to the left:

21-7x-(9)=0

We add all the numbers together, and all the variables

-7x+12=0

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

-7x=-12

x=-12/-7

x=1+5/7

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