100-9f=-20

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Solution for 100-9f=-20 equation: 


Simplifying
100 + -9f = -20

Solving
100 + -9f = -20

Solving for variable 'f'.

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

Add '-100' to each side of the equation.
100 + -100 + -9f = -20 + -100

Combine like terms: 100 + -100 = 0
0 + -9f = -20 + -100
-9f = -20 + -100

Combine like terms: -20 + -100 = -120
-9f = -120

Divide each side by '-9'.
f = 13.33333333

Simplifying
f = 13.33333333

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