-20=f/4

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Solution for -20=f/4 equation: 


f in (-oo:+oo)

-20 = f/4 // - f/4

-(f/4)-20 = 0

-1/4*f-20 = 0 // + 20

-1/4*f = 20 // : -1/4

f = 20/(-1/4)

f = -80

f = -80

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