f/4-f/7=3

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Solution for f/4-f/7=3 equation: 


f in (-oo:+oo)

f/4-(f/7) = 3 // - 3

f/4-(f/7)-3 = 0

3/28*f-3 = 0 // + 3

3/28*f = 3 // : 3/28

f = 3/3/28

f = 28

f = 28

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