6c+3c=-18

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Solution for 6c+3c=-18 equation: 



6c+3c=-18

We move all terms to the left:

6c+3c-(-18)=0

We add all the numbers together, and all the variables

9c+18=0

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

9c=-18

c=-18/9

c=-2

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