X3 x2 4x 6. 4x2+4x+1/x2-4 4x+2/6x-12. ((-X+1)^-1 - ((-X+4)^-1)^2 =<|X^2+6x|/. 2x-1/6-3x +2x+1/2x-4 -x+3/6x-12. X-4/X-2-X/2-X. +X2+x3 - 2x4 = 2 2x1 + 3x2-x3 + x4 = 7 4x1 - 2x2 -5x3 = 1 [5x1 + 4x2-5x3 + 2x4 = 11. X4-2x3-6x2+5x+2. (9^X-10*3^X+9)/9^X-4*3^X. 2x+10=2-x