(77838+3702):(280*804-224214)*30+80=81540:906*30+80=2780;
5207*96+4571040:534-(900*4000-3093468)=499872+8560-506532=1900
(77838+3702):(280*804-224214)*30+80=81540:(225120-224214)*30+80=
=81540:906*30+80= 90*30+80=2780
5207*96+4571040:534-(900*4000-3093468)=499872+8560-32906532=
= -32398100
