(4хb -16): 2=10
(4хb -16)=10 х 2
(4хb -16)=20
4хb =20+16
4хb=36
b=36:4
b=9
Проверка
(4х9 -16):2=10
20:2=10
10=10
(4хb -16): 2=10
(4хb -16)=10 х 2
(4хb -16)=20
4хb =20+16
4хb=36
b=36:4
b=9
Проверка
(4х9 -16):2=10
20:2=10
10=10