30=-7c+9c

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Solution for 30=-7c+9c equation: 



30=-7c+9c

We move all terms to the left:

30-(-7c+9c)=0

We add all the numbers together, and all the variables

-(+2c)+30=0

We get rid of parentheses

-2c+30=0

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

-2c=-30

c=-30/-2

c=+15

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