7x 2 8x 2x. X 4x 1 7 x2 2x 3x 8 x 6. -2(X − 4) = 3 + 7x. X-2/3=3x+1/7. (3x-7)^2=(3x+1)^2. +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. (2x-5)(3x+5)=(x-1)(5x-3) дискриминант