40-4f=20

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Solution for 40-4f=20 equation: 


Simplifying
40 + -4f = 20

Solving
40 + -4f = 20

Solving for variable 'f'.

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

Add '-40' to each side of the equation.
40 + -40 + -4f = 20 + -40

Combine like terms: 40 + -40 = 0
0 + -4f = 20 + -40
-4f = 20 + -40

Combine like terms: 20 + -40 = -20
-4f = -20

Divide each side by '-4'.
f = 5

Simplifying
f = 5

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