21-9f=-20(f-6)

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Solution for 21-9f=-20(f-6) equation:


Simplifying
21 + -9f = -20(f + -6)

Reorder the terms:
21 + -9f = -20(-6 + f)
21 + -9f = (-6 * -20 + f * -20)
21 + -9f = (120 + -20f)

Solving
21 + -9f = 120 + -20f

Solving for variable 'f'.

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

Add '20f' to each side of the equation.
21 + -9f + 20f = 120 + -20f + 20f

Combine like terms: -9f + 20f = 11f
21 + 11f = 120 + -20f + 20f

Combine like terms: -20f + 20f = 0
21 + 11f = 120 + 0
21 + 11f = 120

Add '-21' to each side of the equation.
21 + -21 + 11f = 120 + -21

Combine like terms: 21 + -21 = 0
0 + 11f = 120 + -21
11f = 120 + -21

Combine like terms: 120 + -21 = 99
11f = 99

Divide each side by '11'.
f = 9

Simplifying
f = 9

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