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f in (-oo:+oo)
26-(33/4) < (-2/4)*f-(1/4) // - (-2/4)*f-(1/4)
1/4-((-2/4)*f)-(33/4)+26 < 0
(1/2)*f-33/4+1/4+26 < 0
1/2*f+18 < 0 // - 18
1/2*f < -18 // : 1/2
f < -18/1/2
f < -36
f in (-oo:-36)
(-oo:-36)
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