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f in (-oo:+oo)
(3/8)*f-10 = -11 // + 11
(3/8)*f-10+11 = 0
3/8*f+1 = 0 // - 1
3/8*f = -1 // : 3/8
f = -1/3/8
f = -8/3
f = -8/3
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