c+2c=12

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Solution for c+2c=12 equation: 



c+2c=12

We move all terms to the left:

c+2c-(12)=0

We add all the numbers together, and all the variables

3c-12=0

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

3c=12

c=12/3

c=4

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