13-4f=91

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Solution for 13-4f=91 equation: 


Simplifying
13 + -4f = 91

Solving
13 + -4f = 91

Solving for variable 'f'.

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

Add '-13' to each side of the equation.
13 + -13 + -4f = 91 + -13

Combine like terms: 13 + -13 = 0
0 + -4f = 91 + -13
-4f = 91 + -13

Combine like terms: 91 + -13 = 78
-4f = 78

Divide each side by '-4'.
f = -19.5

Simplifying
f = -19.5

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