Реши уравнение х+454+45=750,х-360=20*9,х*3=1000-340,х: 40=36: 18

х + 454 + 45 = 750
x + 499 = 750
x = 750 - 499
x = 251

х - 360 = 20 * 9
x - 360 = 180
x = 540

х * 3 = 1000 - 340
x * 3 = 660
x = 220

х / 40 = 36 / 18
x / 40 = 2
x = 80