-2c+9=-21

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Solution for -2c+9=-21 equation: 



-2c+9=-21

We move all terms to the left:

-2c+9-(-21)=0

We add all the numbers together, and all the variables

-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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