(x - 40) + 60 * 2 = 2000 : 10
(x - 40) + 120 = 200
x - 40 = 200 - 120
x - 40 = 80
x = 80 + 40
x = 120
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(x - 40) + 60 * 2 = 2000 : 10
(x - 40) + 120 = 200
x - 40 = 200 - 120
x - 40 = 80
x = 80 + 40
x = 120