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f in (-oo:+oo)
f/2.4 = -7.5 // + 7.5
f/2.4+7.5 = 0
0.41666667*f+7.5 = 0 // - 7.5
0.41666667*f = -7.5 // : 0.41666667
f = -7.5/0.41666667
f = -17.99999986
f = -17.99999986
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