13c-7c+3c-7=20

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Solution for 13c-7c+3c-7=20 equation: 



13c-7c+3c-7=20

We move all terms to the left:

13c-7c+3c-7-(20)=0

We add all the numbers together, and all the variables

9c-27=0

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

9c=27

c=27/9

c=3

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