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4-4x+x²-5-x²+2√3x-3≥0
2√3x-4x≥4
(2√3-4)x≥4 2√3-4 jest liczbą ujemną, czyli
x≤4/(2√3-4)
x≤[4(2√3+4) /(2√3-4)(2√3+4)]
x≤(8√3+16)/12-16
x≤-4(-2√3-4)/-4
x≤-2√3-4