21-2c=9

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Solution for 21-2c=9 equation: 



21-2c=9

We move all terms to the left:

21-2c-(9)=0

We add all the numbers together, and all the variables

-2c+12=0

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

-2c=-12

c=-12/-2

c=+6

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