Номер 897

64 : x = 16;
x = 64 : 16;
x = 64 : (8 · 2);
x = 64 : 8 : 2;
x = 4;
64 : 4 = 16;
16 = 16.

y · 14 = 56;
y = 56 : 14;
y = 56 : (7 · 2);
y = 56 : 7 : 2;
y = 4;
4 · 14 = 56;
56 = 56.

12 · z = 80 + 28;
12 · z = 108;
z = 108 : 12;
z = 9;
12 · 9 = 80 + 28;
12 · 9 = 108;
108 = 108.

(68 + 37) : x = 15;
105 : x = 15;
x = 105 : 15;
x = 7;
(68 + 37) : 7 = 15;
105 : 7 = 15;
15 = 15.