2c+9=21

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Solution for 2c+9=21 equation: 


Simplifying
2c + 9 = 21

Reorder the terms:
9 + 2c = 21

Solving
9 + 2c = 21

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 = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2c = 21 + -9
2c = 21 + -9

Combine like terms: 21 + -9 = 12
2c = 12

Divide each side by '2'.
c = 6

Simplifying
c = 6

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