12-C+15-C=7

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Solution for 12-C+15-C=7 equation:


Simplifying
12 + -1C + 15 + -1C = 7

Reorder the terms:
12 + 15 + -1C + -1C = 7

Combine like terms: 12 + 15 = 27
27 + -1C + -1C = 7

Combine like terms: -1C + -1C = -2C
27 + -2C = 7

Solving
27 + -2C = 7

Solving for variable 'C'.

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

Add '-27' to each side of the equation.
27 + -27 + -2C = 7 + -27

Combine like terms: 27 + -27 = 0
0 + -2C = 7 + -27
-2C = 7 + -27

Combine like terms: 7 + -27 = -20
-2C = -20

Divide each side by '-2'.
C = 10

Simplifying
C = 10

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