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x-15x<9-51
-14x<-42
-1(-14x<-42)
14x>42
x>42/14
x>3
X pertenese desde <3;+∞>
x + 51 < 15x + 9
51 - 9 < 15x - x
42 < 14x
42/14 < x
3 < x
x > 3
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3
Solucion.
(3 , infinito)