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f in (-oo:+oo)
0.3 = (1+19)*((24*f)/1.4) // - (1+19)*((24*f)/1.4)
0.3-((1+19)*((24*f)/1.4)) = 0
0.3-17.14285714*(1+19)*f = 0
0.3-342.8571428*f = 0 // - 0.3
-342.8571428*f = -0.3 // : -342.8571428
f = -0.3/(-342.8571428)
f = 0.000875
f = 0.000875
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