Помогите!
7х+9=100
26х-0.8=7
1\2х-1\3=1\6
17.5х-0.5=34.5
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7x = 100-9
7х = 91
х = 13
2) 26х-0.8=7
26х = 7.8
х = 0.3
3) 1/2x - 1/3=1/6
1/2x=1/6+1/3
1/2x=3/6
1/2x=1/2
x=1
4)17.5x-0.5=34.5
17.5x=34.5+0.5
17.5x=35
x=2