f+-13=-91

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Solution for f+-13=-91 equation: 


Simplifying
f + -13 = -91

Reorder the terms:
-13 + f = -91

Solving
-13 + f = -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 + f = -91 + 13

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

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

Simplifying
f = -78

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