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2(3x+5)-3(11-5x)≥4(-7+4x)
6x+10-33+15x≥-28+16x
6x+15x-16x≥-28+33-10
5x≥-5/: 5
x≥ -1
zad3
(4x-3)(3x+5)+3x≤(2x+4)(6x-5)
12x²+20x-9x-15+3x≤12x²-10x+24x-20
12x²+20x-9x+3x-12x²+10x-24x≤-20+15
0≤ - 5
6x+10-33+15x>=-28+16x
21x-16x>=-28+23
5x>=-5
x>=-1
x€<-1,+ nieskon.)
3)
12x^2+20x-9x-15+3x<=12x^2-10x+24x-20
14x-15<=14x-20
-15<=-20
nierówność nieprawdziwa