3c-21r=-12

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Solution for 3c-21r=-12 equation: 


Simplifying
3c + -21r = -12

Solving
3c + -21r = -12

Solving for variable 'c'.

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

Add '21r' to each side of the equation.
3c + -21r + 21r = -12 + 21r

Combine like terms: -21r + 21r = 0
3c + 0 = -12 + 21r
3c = -12 + 21r

Divide each side by '3'.
c = -4 + 7r

Simplifying
c = -4 + 7r

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