1) [(e:8+5609):2-111]:10=400
[(e:8+5609):2-111]=400*10
[(e:8+5609):2-111]=4000
(e:8+5609):2=4000+111
(e:8+5609):2=4111
(e:8+5609)=4111*2
(e:8+5609)=8222
e:8=8222-5609
e:8=2613
e=2613*8
e=20904
2) (540:6x9-755):(g-386)=5
(90x9-755):(g-386)=5
(810-755):(g-386)=5
55:(g-386)=5
g-386=55/5
g=386+11
g=397
