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f in (-oo:+oo)
13 = (3/8)*f-2 // - (3/8)*f-2
2-((3/8)*f)+13 = 0
(-3/8)*f+2+13 = 0
15-3/8*f = 0 // - 15
-3/8*f = -15 // : -3/8
f = -15/(-3/8)
f = 40
f = 40
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