1) (1,34+×)-58,3=4,26
1,34+х=4,26+58,3
1,34+х=62,56
х=62,56-1,34
х=61,22
2) (×+50,6)+2,15=42,9
х+50,6=42,9-2,15
х+50,6=40,75
х=40,75-50,6
х=-9,85