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3x(12x²-5x-5+42x-12x²)-11x²=
3x(37x-5)-11x²=
111x²-15x-11x²=
100x²-15x=
100*(0,4)²-15(0,4)=
100*0,16 -6=
16-6=10
3x[37x-5]-11x do kwadratu
111x do kwadratu - 15x - 11x do kwadratu
100x do kwadratu - 15x
x=0,4
100 * 0,4 kwadrat - 15 *0,4 = 16 - 6 = 10