a) (525/5+b)/5+12=790
(105+b) / 5 +12=709/-12
105 +b /5= 697 x 5
105+b=3485-105
b=3380
b) (65*502/10-c-63)/3=600
32630/10-c-63=600 x 3
3263-c-63=1800/+63
3263-c=1863
c=3263-1863
c=1400
c)[(e/8+5609)/2-111]/10=400
(e/8+5609)/2-111=400 x 10
(e/8+5609)/2-111=4000/+111
(e/8+5609)/2=4111/x2
e/8 +5609=8222/-5609
e/8=2613 x 8
e=20904
d)(540/5*9-755)/(g-386)=5
540/45 - 744 / g-386=5
12-744/g-386=5/+386
12-744/g=391-12
-744/g=379/ x 744
g=281976
