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x²+3x-2x-6 ≥ x²-6x-5x+30
3x+6x+5x ≥ 30+6
14x ≥ 36 /:14
x ≥ 36/14
x ≥ 2,57
x²-6 >=x² + 30
x²-x² >= 36
x>=36
x²+3x-2x-6 >= x²-6x-5x+30
-6-30>= -6x-5x-3x
-36>= -14x
2,57 >= x