28=-4c-9c

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Solution for 28=-4c-9c equation: 



28=-4c-9c

We move all terms to the left:

28-(-4c-9c)=0

We add all the numbers together, and all the variables

-(-13c)+28=0

We get rid of parentheses

13c+28=0

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

13c=-28

c=-28/13

c=-2+2/13

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