25+92/(21+((7х-4)/19+3)*5)=27
92/(21+((7х-4)/19+3)*5)=27-25
92/(21+((7х-4)/19+3)*5)=2
92=2*(21+((7х-4)/19+3)*5)
21+((7х-4)/19+3)*5)=92/2
21+((7х-4)/19+3)*5)=46
((7х-4)/19+3)*5)=46-21
((7х-4)/19+3)*5=25
(7х-4)/19+3=25/5
(7х-4)/19=5-3
(7х-4)=2*19
7х=38+4
7х=42
х=42/7
х=6