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f in (-oo:+oo)
6 = (3/8)*f // - (3/8)*f
6-((3/8)*f) = 0
(-3/8)*f+6 = 0
6-3/8*f = 0 // - 6
-3/8*f = -6 // : -3/8
f = -6/(-3/8)
f = 16
f = 16
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