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t-7/4<1/t² /*4t²
4t³-7t²-4 <0
4t² (t-2)+(t²-4) <0
4t²(t-2) + (t+2)(t-2)<0
(t-2)(4t²+t+2)<0
t-2<0, II nawias jest stale dodatni, nie ma m.z. Δ<0
t<2
2^x<2
x<1