1) 23 х -13 х+4,83=7,9
10x = 7,9-4,83
10x = 3,07
x = 3,07:10
x = 0,307
2) 197х -97х -1,1=8,82
100x = 8,82+1,1
100x = 9,92
x = 9,92:100
х = 0,992
3) 7,8х+992,2х-0,5=9,1
1000х = 9,1+0,5
1000х = 9,6
х = 9,6:1000
х = 0,0096
4) 1,12х+8,88х+9,1=25,07
10х = 25,07-9,1
10х = 15,97
х = 15,97:10
х = 1,597