9.8-6x=5又 4/5
6x=4
x=2/3
(x-7)÷5=14
x-7=70
x=77
4x-1.8*5=2
4x-9=2
4x=11
x=2.75
x+20%=4/7
x=4/7-1/5
x=13/35
x-20%x=97-17
0.8x=80
x=100
3/3x=30%
1/x=30%
x=10/3
7/5-5x=4/5
5x=3/5
x=3/25
9.8-6x=5又 4/5
6x=4
x=2/3
(x-7)÷5=14
x-7=70
x=77
4x-1.8*5=2
4x-9=2
4x=11
x=2.75
x+20%=4/7
x=4/7-1/5
x=13/35
x-20%x=97-17
0.8x=80
x=100
3/3x=30%
1/x=30%
x=10/3
7/5-5x=4/5
5x=3/5
x=3/25