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2014-05-04T12:14:54+03:00
X²-x≤4x²-4x+1+x-6
3x²-2x-5≥0
3x²-2x-2-3≥0
3(x²-1)-2(x+1)≥0
3(x-1)(x+1)-2(x+1)≥0
(x+1)(3x+3-2)≥0
x+1≥0
x≥-1
3x+1≥0
3x≥-1
x≥-1/3
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