[(5x+6)/8]=(15x-7)/5两边乘以40[25x+30]=120x-56两边+56[25x+86]=120x两边除以x[25+86/x]=120两边-25[86/x]=95两边除以95[0.91x]=1x=0.91取 x=0.9[25x+86]=120x左边【25*0.9+86】=108右边120*0.9=108...