Răspuns :
(525:5+b):5+12=790(105+b):5+12=790/-12
(105+b):5=778/*5
105+b=3890/-105
b=3785
(105+b):5=778/*5
105+b=3890/-105
b=3785
(525:5+b):5+12=790
(105+b):5=790+12
(105+b):5=788
(105+b)=788x5
(105+b)=3900
b=3900-105
b=3895