426.
а) (х-4.7)*7.3=38.69
7.3х - 34.31=38.69
7.3х=38.69+34.31
7.3х=73
х=73:7.3
х= 10.
б) (3.6 - а) * 5.8= 14.5
20.88 - 5.8а=14.5
-5.8а=-6.38
а=1.1
в) 23.5 - (23а+1.2)= 19.3
23.5 - 2.3а - 1.2а = 19.3
-3.5а=19.3-23.5
-3.5а=-4.2
а=1.2
г) 12.98 - (3.8х - 1.3х)=11.23
12.98 - 3.8х + 1.3х = 11.23
-2.5х=11.23-12.98
-2.5х= -1.75
х = 0.7