(5x-3)/4=5/12 两边册前埋乘12
3(5x-3)=5
15x-9=5
15x=5+9=14
x=14/15
1/7(x+14)州蚂悔返=1/4(x+20) 两边乘28
4(x+14)=7(x+20)
4x+56=7x+140
7x-4x=56-140
3x=-84
x=-28
(5x-3)/4=5/12
两边同时乘以12,得3(5x-3)=5,则15x-9=5,则15x=14,则x=14/15
1/7(x+14)=1/4(x+20)
两边同时丛锋厅乘以渗隐28,得4(x+14)=7(x+20)
则基慎4x+56=7x+140,则7x-4x=56-140,则3x=-84,则x=-28
解;(5x-3)运芦/4=5/12 两边乘12
3(5x-3)=5
15x-9=5
15x=5+9=14
x=14/15
1/李吵7(x+14)=1/4(x+20) 两边乘哪悄侍28
4(x+14)=7(x+20)
4x+56=7x+140
7x-4x=56-140
3x=-84
x=-28
(5x-3)/4=5/12 两边乘袭和拦友12
3(5x-3)=5
15x-9=5
x=14/15
1/7(x+14)=1/4(拍衡盯x+20) 两边乘28
4(x+14)=7(x+20)
4x+56=7x+140
x=-28
(5x-3)/4=5/升悉12
解旅闭:5/4x-3/4=5/12
5/吵镇乎4x=5/12+9/12
5/4x=7/6
x=7/6×4/5
x=14/15