2x-(7-3x)/5=4-6x
10x-(7-3x)=20-30x
13x-7=20-30x
43x=27
x=27/43
2mx-(3x-5)/4=2-(5x-1)/6
24mx-3(3x-5)=24-2(5x-1)
24mx-9x+15=24-10x+2
24mx+x=11
(24m+1)x=11
将x=27/43代入上式
(24m+1)x=11
24m+1=11*(43/27)
24m+1=473/27
24m=446/27
m=446/27÷24
m=223/324加油