x + 3.2 = 4.6 x = 4.6 - 3.2x = 1.4x - 2 = 15x = 15 + 2x = 17x + 0.3 = 1.8x = 1.8 - 0.3x = 1.53 + x = 5.4x = 5.4 - 3x = 2.4x - 1.5 = 4x = 4 + 1.5x = 5.5x - 6 = 7.6x = 7.6 + 6x = 13.6望采纳!