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f in (-oo:+oo)
(3/8)*f+0.5 = 6*((1/16)*f-3) // - 6*((1/16)*f-3)
(3/8)*f-(6*((1/16)*f-3))+0.5 = 0
(3/8)*f-6*((1/16)*f-3)+0.5 = 0
(3*f)/8-6*(1/16*f-3)+0.5 = 0
(-6*8*(1/16*f-3))/8+(3*f)/8+(0.5*8)/8 = 0
3*f-6*8*(1/16*f-3)+0.5*8 = 0
4+144 = 0
148 = 0
148/8 = 0
148/8 = 0 // * 8
148 = 0
f belongs to the empty set
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