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4x + 6x - 20 ≥ 5x + 120 - 3x
10x - 20 ≥ 2x + 120
10x - 2x ≥ 120 + 20
8x ≥ 140
x ≥ 140/8 Simplificas
x ≥ 35/2
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35/2
Solucion.
Intervalo cerrrado a la izquierda.
[35/2, infinito)