1.2/9×（x＋1）＝6 => (x + 1) = 6 * 9/2 = 27=> x = 27 -1 = 262.x = 1.2 * 4/13 = 4.8/13 = 48 / 130 = 24 / 653.16.9×（3 - 2x）＝0=> 3(16.9)- 2(16.9)x = 0=> 3(16.9) = 2(16.9)x=> x = ...