18c+-16c+9c+12c-18c=-20

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Solution for 18c+-16c+9c+12c-18c=-20 equation: 



18c+-16c+9c+12c-18c=-20

We move all terms to the left:

18c+-16c+9c+12c-18c-(-20)=0

We add all the numbers together, and all the variables

5c+20=0

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

5c=-20

c=-20/5

c=-4

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