c+c-12=90

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Solution for c+c-12=90 equation:


Simplifying
c + c + -12 = 90

Reorder the terms:
-12 + c + c = 90

Combine like terms: c + c = 2c
-12 + 2c = 90

Solving
-12 + 2c = 90

Solving for variable 'c'.

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

Add '12' to each side of the equation.
-12 + 12 + 2c = 90 + 12

Combine like terms: -12 + 12 = 0
0 + 2c = 90 + 12
2c = 90 + 12

Combine like terms: 90 + 12 = 102
2c = 102

Divide each side by '2'.
c = 51

Simplifying
c = 51

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