20=-f

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Solution for 20=-f equation:


Simplifying
20 = -1f

Solving
20 = -1f

Solving for variable 'f'.

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

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

Combine like terms: -1f + f = 0
20 + f = 0

Add '-20' to each side of the equation.
20 + -20 + f = 0 + -20

Combine like terms: 20 + -20 = 0
0 + f = 0 + -20
f = 0 + -20

Combine like terms: 0 + -20 = -20
f = -20

Simplifying
f = -20

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