20=40-4f

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Solution for 20=40-4f equation:


Simplifying
20 = 40 + -4f

Solving
20 = 40 + -4f

Solving for variable 'f'.

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

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

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

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

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

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

Divide each side by '4'.
f = 5

Simplifying
f = 5

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