20+4-f=12

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Solution for 20+4-f=12 equation: 


Simplifying
20 + 4 + -1f = 12

Combine like terms: 20 + 4 = 24
24 + -1f = 12

Solving
24 + -1f = 12

Solving for variable 'f'.

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

Add '-24' to each side of the equation.
24 + -24 + -1f = 12 + -24

Combine like terms: 24 + -24 = 0
0 + -1f = 12 + -24
-1f = 12 + -24

Combine like terms: 12 + -24 = -12
-1f = -12

Divide each side by '-1'.
f = 12

Simplifying
f = 12

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