18-[-f]=91

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Solution for 18-[-f]=91 equation:


Simplifying
18 + -1[-1f] = 91

Remove brackets around [-1f]
18 + -1 * -1f = 91

Multiply -1 * -1
18 + 1f = 91

Solving
18 + 1f = 91

Solving for variable 'f'.

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

Add '-18' to each side of the equation.
18 + -18 + 1f = 91 + -18

Combine like terms: 18 + -18 = 0
0 + 1f = 91 + -18
1f = 91 + -18

Combine like terms: 91 + -18 = 73
1f = 73

Divide each side by '1'.
f = 73

Simplifying
f = 73

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