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f in (-oo:+oo)
8-((5*f)/6) = 4 // - 4
8-((5*f)/6)-4 = 0
(-5/6)*f-4+8 = 0
4-5/6*f = 0 // - 4
-5/6*f = -4 // : -5/6
f = -4/(-5/6)
f = 24/5
f = 24/5
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