x/4-x/5≥6 mayor valor de x ploqs <3

[tex] {\dfrac{x}{4}-\dfrac{x}{5}\geq 6 \ \ (\times 20)}\\\\{5x-4x\geq 120}\\\\{x\geq 120}\\\\\\{\forall x\in[120,+\infty )} \\\\\\{\text{salu2.}} [/tex]