0,75(1/6 IxI-1/3)=3IXI-11,5
0,75 (1/6 IxI - 1/3) = 3 IxI - 11,5 1/6 IxI - 1/3 = 4 IxI - 46/3 46/3 - 1/3 = 4 IxI - 1/6 IxI 45/3 = 23/6 IxI 23/6 IxI = 15 IxI = 15 * 6 / 23 IxI = 90/23 х₁ = 90/23 х₂ = -90/23