7/4=(f-4)/8

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Solution for 7/4=(f-4)/8 equation: 


f in (-oo:+oo)

7/4 = (f-4)/8 // - (f-4)/8

7/4-((f-4)/8) = 0

(-1*(f-4))/8+7/4 = 0

(-1*4*(f-4))/(4*8)+(7*8)/(4*8) = 0

7*8-1*4*(f-4) = 0

72-4*f = 0

(72-4*f)/(4*8) = 0

(72-4*f)/(4*8) = 0 // * 4*8

72-4*f = 0

72-4*f = 0 // - 72

-4*f = -72 // : -4

f = -72/(-4)

f = 18

f = 18

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