18c+3c=84

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Solution for 18c+3c=84 equation: 


Simplifying
18c + 3c = 84

Combine like terms: 18c + 3c = 21c
21c = 84

Solving
21c = 84

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Divide each side by '21'.
c = 4

Simplifying
c = 4

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