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33≤ 3/2x+12 ^ 3/2x+12<36
33-12 ≤ 3/2x 3/2x<36-12
21≤ 3/2x 3/2x<24
3x ≥21×2 3x<24x2
x≥42/3 3x<48
x≥14 x<16
hasta grafica lineal