21x+9=12

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Solution for 21x+9=12 equation: 



21x+9=12

We move all terms to the left:

21x+9-(12)=0

We add all the numbers together, and all the variables

21x-3=0

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

21x=3

x=3/21

x=1/7

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