21.6=6c-9

Solution for 21.6=6c-9 equation:

Simplifying
21.6 = 6c + -9

Reorder the terms:
21.6 = -9 + 6c

Solving
21.6 = -9 + 6c

Solving for variable 'c'.

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

Add '-6c' to each side of the equation.
21.6 + -6c = -9 + 6c + -6c

Combine like terms: 6c + -6c = 0
21.6 + -6c = -9 + 0
21.6 + -6c = -9

Add '-21.6' to each side of the equation.
21.6 + -21.6 + -6c = -9 + -21.6

Combine like terms: 21.6 + -21.6 = 0.0
0.0 + -6c = -9 + -21.6
-6c = -9 + -21.6

Combine like terms: -9 + -21.6 = -30.6
-6c = -30.6

Divide each side by '-6'.
c = 5.1

Simplifying
c = 5.1