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-15x-3x²+30+6x≥0
-3x²-9x+30≥0
Δ=b²-4ac
Δ=81-4*(-3)*30=81+360=441
√Δ=21
x₁=(9-21)/-6=2
x₂=(9+21)/-6=-5
odp x∈<2,+nieskończoność)