C+(9-3)=21

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Solution for C+(9-3)=21 equation: 


Simplifying
C + (9 + -3) = 21

Combine like terms: 9 + -3 = 6
C + (6) = 21
C + 6 = 21

Reorder the terms:
6 + C = 21

Solving
6 + C = 21

Solving for variable 'C'.

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

Add '-6' to each side of the equation.
6 + -6 + C = 21 + -6

Combine like terms: 6 + -6 = 0
0 + C = 21 + -6
C = 21 + -6

Combine like terms: 21 + -6 = 15
C = 15

Simplifying
C = 15

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