a) 7 2 x-1 - x+1 = 5 2 x²-1 b) 3 4 5x+7 = x+5 x-5 x²-25 2 3 3x+5 2 3x + = d) 3x²-4 + = X- 3 2x x+3x²-9 x+2x²+5 x-3 x+3 x²-9 e) == x-1 f) x+2 2 x+8 = x+1 x²-1 x-2 2 5 x+6 g) + x+2 2-x == x²-4 h) x+2x²-4 x-1 x 7x-3 - x+3 12 1-3x 1+3x 1 = x-3 9-x² 2x == 1-9x² 1+3x j) - 1-3x x-1 3x² = x³-1 ...