3c-5=7c-21

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Solution for 3c-5=7c-21 equation: 



3c-5=7c-21

We move all terms to the left:

3c-5-(7c-21)=0

We get rid of parentheses

3c-7c+21-5=0

We add all the numbers together, and all the variables

-4c+16=0

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

-4c=-16

c=-16/-4

c=+4

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