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f in (-oo:+oo)
f/5.25 = 7.8 // - 7.8
f/5.25-7.8 = 0
0.19047619*f-7.8 = 0 // + 7.8
0.19047619*f = 7.8 // : 0.19047619
f = 7.8/0.19047619
f = 40.9500001
f = 40.9500001
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