15,62+x=20
9,54-x=7,268
x-36,76=15,148
x-0,24=8,1

Пошаговое объяснение:

1) 15,62 + x = 20;

x = 20 - 15,62;

х = 4,38;

2) 9.54 - х = 7.268;

х = 9,54 до 7.268;

х = 2,272;

3) х - 36,76 = 19,24;

х = 19,24 + 36,76;

x = 56;

4) x + 0,24 = 8,1;

x = 8,1 - 0,24;

x = 7,86.