30 + 40 : (у - 37) = 50
40 : (у - 37) = 50 - 30
40 : (у - 37) = 20
у - 37 = 40 : 20
у - 37 = 2
у = 2 + 37
у = 39
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Проверка: 30 + 40 : (39 - 37) = 50
30 + 40 : 2 = 50
30 + 20 = 50
50 = 50
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Verified answer
30 + 40 : (у - 37) = 50
40 : (у - 37) = 50 - 30
40 : (у - 37) = 20
у - 37 = 40 : 20
у - 37 = 2
у = 2 + 37
у = 39
-------------------------------------------------
Проверка: 30 + 40 : (39 - 37) = 50
30 + 40 : 2 = 50
30 + 20 = 50
50 = 50