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f in (-oo:+oo)
f/1.5 = 30 // - 30
f/1.5-30 = 0
0.66666667*f-30 = 0 // + 30
0.66666667*f = 30 // : 0.66666667
f = 30/0.66666667
f = 44.99999978
f = 44.99999978
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