C-9+C=-12

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Solution for C-9+C=-12 equation: 


Simplifying
C + -9 + C = -12

Reorder the terms:
-9 + C + C = -12

Combine like terms: C + C = 2C
-9 + 2C = -12

Solving
-9 + 2C = -12

Solving for variable 'C'.

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

Add '9' to each side of the equation.
-9 + 9 + 2C = -12 + 9

Combine like terms: -9 + 9 = 0
0 + 2C = -12 + 9
2C = -12 + 9

Combine like terms: -12 + 9 = -3
2C = -3

Divide each side by '2'.
C = -1.5

Simplifying
C = -1.5

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