А) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
х * 7 1/12=3 6/23 -х*7 1/12=3 6/23
х=75/23 : 85/12 х= -75/23 : 85/12
х=75/23 * 12/85 х= -75/23 * 12/85
х1=180/391 х1= -180/391
х=±180/391
б) ...................................
х :40/13=305/42 -х :40/13=305/42
х=305/42 * 40/13 -х=305/42 * 40/13
х=22 94/273 х= - 22 94/273
х=±22 94/273