Реши уравнения. x − 6 = 9 x + 2 = 42 23 − x = 3
x − 6 = 9 x = 15 15 − 6 = 9 x + 2 = 42 x = 40 40 + 2 = 42 23 − x = 3 x = 20 23 − 20 = 3