Уравнение 72;b+13=19?

Question

Уравнение 72;b+13=19?

Answer 1

B+13=19b=19-13
b=6
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Answer 2

72:b+13=19
72:b=19-13
72:b=6
b=72:6
b=12
Проверка
72:12+13=19