X +120 = 40×5 x + 20 = 40×5
x×5 = 240
x 10 = 240
9× x= 72
8× x= 72
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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