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x2+x<0+6
2x2<6
4x<6
b) x2+x+3>0
x2+x>0-3
2x2>-3
4x>+3
c)4x2+5x+1<0
4x+5x<0-1
9x2 < -1
81x < - 1
d)-x2+3x+9<0
-x2+3x < 0-9
x2 < -9