х+120=40×5
x + 120 =200
x =200 - 120
x = 80
x+ 20= 40 * 5
x + 20 = 200
x=200 -20
x = 120
x * 5 = 240
x=240 ÷ 5
x = 28
x * 10 = 240
x = 240 ÷ 10
x = 24
9 * х дорівнює 72
x = 72 / 9
x = 8
8 * x = 72
x = 72 / 8
x = 9
