53,76:(4,248-1,56х)+3,8=55
53,76:(4,248-1,56х)=55-3,8
53,76:(4,248-1,56х)=51,2
4,248-1,56х=53,76:51,2
4,248-1,56х=1,05
-1,56х=4,248-1,05
-1,56х=3,198
-х=3,198:1,56
-х=2,05
х=-2,05
(2,7у+3,08у):1,7-3,08=12,22
(2,7у+3,08у):1,7=12,22+3,08
(2,7у+3,08у):1,7=15,3
2,7у+3,08у=15,3*1,7
5,78у=26,01
у=26,01:5,78
у=4,5