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f in (-oo:+oo)
f/1.5 = 3 // - 3
f/1.5-3 = 0
0.66666667*f-3 = 0 // + 3
0.66666667*f = 3 // : 0.66666667
f = 3/0.66666667
f = 4.49999998
f = 4.49999998
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