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f in (-oo:+oo)
(-1/8)*f-((1/4)*f)-(3/4) = 11 // - 11
(-1/8)*f-((1/4)*f)-(3/4)-11 = 0
(-1/8)*f+(-1/4)*f-3/4-11 = 0
-3/8*f-47/4 = 0 // + 47/4
-3/8*f = 47/4 // : -3/8
f = 47/4/(-3/8)
f = -94/3
f = -94/3
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