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x-2x<7/5-2/3
-x<11/15
//Multiplicamos por -1 sin olvidar invertir el sentido de la desigualdad:
x>-11/15
Entonces:
C.S.={x E R | x>-11/15} o x E (-11/15,∞)
x - 2x < 7/5 - 2/3
-x < 11/15
(*1)
x > -11/15