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f in (-oo:+oo)
f/4 = 7/8 // - 7/8
f/4-(7/8) = 0
f/4-7/8 = 0
1/4*f-7/8 = 0 // + 7/8
1/4*f = 7/8 // : 1/4
f = 7/8/1/4
f = 7/2
f = 7/2
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