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f in (-oo:+oo)
f/18 = 48/27 // - 48/27
f/18-(48/27) = 0
f/18-16/9 = 0
1/18*f-16/9 = 0 // + 16/9
1/18*f = 16/9 // : 1/18
f = 16/9/1/18
f = 32
f = 32
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