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f in (-oo:+oo)
f/4 = 3.8 // - 3.8
f/4-3.8 = 0
1/4*f-3.8 = 0 // + 3.8
1/4*f = 3.8 // : 1/4
f = 3.8/1/4
f = 15.2
f = 15.2
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