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x^2 -8x^2 -10x -8x <=0
-7x^2 -18x <=0
7x^2 +18x >=0
x(7x+18)>=0
-18/7 0
x - - - - - - - - - -0 + + +
7x+18 - - - - 0 + + + ++ +
La expresión es positiva cuando x esta en
(-inf, -18/7) U (0,inf)