(1) (2x-1)/2-(1-3x)/7=2
同时乘以14,得
7(2x-1)-2(1-3x)=28
14x-7-2+6x=28
20x=37
x=37/20
(2) (2-x)/5+(3x-1)/4=0
同时乘以20,得
4(2-x)+5(3x-1)=0
11x+3=0
x=-3/11
(3) (3m-1)/4-(1-2m)/3=-2
同时乘以12,得
3(3m-1)-4(1-2m)=-24
9m-3-4+8m=-24
17m=-17
m=-1