21=4c-9

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Solution for 21=4c-9 equation:


Simplifying
21 = 4c + -9

Reorder the terms:
21 = -9 + 4c

Solving
21 = -9 + 4c

Solving for variable 'c'.

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

Add '-4c' to each side of the equation.
21 + -4c = -9 + 4c + -4c

Combine like terms: 4c + -4c = 0
21 + -4c = -9 + 0
21 + -4c = -9

Add '-21' to each side of the equation.
21 + -21 + -4c = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -4c = -9 + -21
-4c = -9 + -21

Combine like terms: -9 + -21 = -30
-4c = -30

Divide each side by '-4'.
c = 7.5

Simplifying
c = 7.5

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