(3/5x-20)*4/5=2/5x
兩邊同時乘以5/4:
3/5x-20=1/2x
(3/5-1/2)x=20
1/10x=20
x=200
(2/3)x-(5/6)=5x-3/4
(2/3)x-(5/6)=5x-3/4
5x-(2/3)x=3/4-(5/6)
13x/3=-1/12
x=-1/52
0.5x+3分之2=1(5分之1+x)÷4分之1=3
0.5x=1/3
x=2/3
1/5+x=12
x=11又(4/5)