c+42=3c

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Solution for c+42=3c equation: 



c+42=3c

We move all terms to the left:

c+42-(3c)=0

We add all the numbers together, and all the variables

-2c+42=0

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

-2c=-42

c=-42/-2

c=+21

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