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F in (-oo:+oo)
F/4 = 1.9 // - 1.9
F/4-1.9 = 0
1/4*F-1.9 = 0 // + 1.9
1/4*F = 1.9 // : 1/4
F = 1.9/1/4
F = 7.6
F = 7.6
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