21=5c-9

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Solution for 21=5c-9 equation:


Simplifying
21 = 5c + -9

Reorder the terms:
21 = -9 + 5c

Solving
21 = -9 + 5c

Solving for variable 'c'.

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

Add '-5c' to each side of the equation.
21 + -5c = -9 + 5c + -5c

Combine like terms: 5c + -5c = 0
21 + -5c = -9 + 0
21 + -5c = -9

Add '-21' to each side of the equation.
21 + -21 + -5c = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -5c = -9 + -21
-5c = -9 + -21

Combine like terms: -9 + -21 = -30
-5c = -30

Divide each side by '-5'.
c = 6

Simplifying
c = 6

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