9c+1=7c+21

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Solution for 9c+1=7c+21 equation: 



9c+1=7c+21

We move all terms to the left:

9c+1-(7c+21)=0

We get rid of parentheses

9c-7c-21+1=0

We add all the numbers together, and all the variables

2c-20=0

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

2c=20

c=20/2

c=10

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