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4(2x²-3x+10x-15)≥3(3x²-2x+15x-10)
4(2x²+7x-15)≥3(3x²+13x-10)
8x²+28x-60≥9x²+39x-30
-x²-11x-30≥0 /*(-1)
x²+11x+30≤0
Δ=121-120=1 √Δ=1
x1=(-11-1)/2=-12/2=-6
x2=(-11+1)/2=-10/2=-5
ramiona paraboli skierowane do góry więc
x∈<-6;-5>