(12 21/32+x)-4 5/8=13 1/16

Решим уравнение по действиям:

1) 13 1/16 = (13 * 16 + 1)/16 = 209/16;

2) 4 5/8 = (4 * 8 + 5)/8 = 37/8;

3) 209/16 + 37/8 = 209/16 + 74/16 = (209 + 74)/16 = 283/16;

4) 12 21/32 = (12 * 32 + 21)/32 = (384 + 21)/32 = 405/32;

5) 405/32 + х = 283/16;

х = 283/16 - 405/32 = 566/32 - 405/32 = (566 - 405)/32 = 161/32.

Ответ: х = 161/32.