-20=f/2

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Solution for -20=f/2 equation: 


f in (-oo:+oo)

-20 = f/2 // - f/2

-(f/2)-20 = 0

-1/2*f-20 = 0 // + 20

-1/2*f = 20 // : -1/2

f = 20/(-1/2)

f = -40

f = -40

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