c+c-9=15

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Solution for c+c-9=15 equation: 


Simplifying
c + c + -9 = 15

Reorder the terms:
-9 + c + c = 15

Combine like terms: c + c = 2c
-9 + 2c = 15

Solving
-9 + 2c = 15

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 = 15 + 9

Combine like terms: -9 + 9 = 0
0 + 2c = 15 + 9
2c = 15 + 9

Combine like terms: 15 + 9 = 24
2c = 24

Divide each side by '2'.
c = 12

Simplifying
c = 12

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