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(-21t+32)/(4t-5)>=-6
(-21t+32)/(4t-5)+6>=0
(-21t+32+6(4t-5))/(4t-5)>=0
(-21t+32+24t-30)/(4t-5)>=0
(3t+2)/(4t-5)>=0
En el numerador: 3t+2=0 ---->t=-2/3
En el denominador: 4t-5=0 ---->t=5/4
Los conjuntos que satisfacen son (-infinito,-2/3]U[5/4;+infinito]