15=21-2c

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Solution for 15=21-2c equation:


Simplifying
15 = 21 + -2c

Solving
15 = 21 + -2c

Solving for variable 'c'.

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

Add '2c' to each side of the equation.
15 + 2c = 21 + -2c + 2c

Combine like terms: -2c + 2c = 0
15 + 2c = 21 + 0
15 + 2c = 21

Add '-15' to each side of the equation.
15 + -15 + 2c = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2c = 21 + -15
2c = 21 + -15

Combine like terms: 21 + -15 = 6
2c = 6

Divide each side by '2'.
c = 3

Simplifying
c = 3

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