2x 8x 3x 2 6x 10. (X+5)^2-(X-5)^2. 2x+10=2-x. |X^2+7x|=4x+10. (7x+4)4x(5-2x). 5x^2=3x+2. X4+x2+1 : x2-4x+5. X^2-3x+2/x+4=0. (X-2)^3. +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