Nobody
Delta-Age: 15, Boy, English Denis- Age: 9, Boy, Russian-Belorussian Dasha- Age: 8/9 (Today 2 Fe...
Even 15-year-old English people can't solve this, for example, equations from Class 3: X-5=13
Moon Uranus's
I'm in real life: https://pasteboard.co/JMeC07h.jpg
I try
(Edit) Moon Jupiter's