21=(8-c)3

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Solution for 21=(8-c)3 equation:


Simplifying
21 = (8 + -1c) * 3

Reorder the terms for easier multiplication:
21 = 3(8 + -1c)
21 = (8 * 3 + -1c * 3)
21 = (24 + -3c)

Solving
21 = 24 + -3c

Solving for variable 'c'.

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

Add '3c' to each side of the equation.
21 + 3c = 24 + -3c + 3c

Combine like terms: -3c + 3c = 0
21 + 3c = 24 + 0
21 + 3c = 24

Add '-21' to each side of the equation.
21 + -21 + 3c = 24 + -21

Combine like terms: 21 + -21 = 0
0 + 3c = 24 + -21
3c = 24 + -21

Combine like terms: 24 + -21 = 3
3c = 3

Divide each side by '3'.
c = 1

Simplifying
c = 1

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