9(8-f)=5(12-f)

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Solution for 9(8-f)=5(12-f) equation:


Simplifying
9(8 + -1f) = 5(12 + -1f)
(8 * 9 + -1f * 9) = 5(12 + -1f)
(72 + -9f) = 5(12 + -1f)
72 + -9f = (12 * 5 + -1f * 5)
72 + -9f = (60 + -5f)

Solving
72 + -9f = 60 + -5f

Solving for variable 'f'.

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

Add '5f' to each side of the equation.
72 + -9f + 5f = 60 + -5f + 5f

Combine like terms: -9f + 5f = -4f
72 + -4f = 60 + -5f + 5f

Combine like terms: -5f + 5f = 0
72 + -4f = 60 + 0
72 + -4f = 60

Add '-72' to each side of the equation.
72 + -72 + -4f = 60 + -72

Combine like terms: 72 + -72 = 0
0 + -4f = 60 + -72
-4f = 60 + -72

Combine like terms: 60 + -72 = -12
-4f = -12

Divide each side by '-4'.
f = 3

Simplifying
f = 3

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