21x-12x=9

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Solution for 21x-12x=9 equation: 



21x-12x=9

We move all terms to the left:

21x-12x-(9)=0

We add all the numbers together, and all the variables

9x-9=0

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

9x=9

x=9/9

x=1

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