5(8х-1)-7(4х-1)+8(х-4)=9

40х-5-28+7+8х-32=9 40х+8х=9+5+28-7 48х=14+28-7 48х=42-7 48х=35 х=1(13)

[latex] \\ 5*(8*x-1)-7*(4*x-1)+8(x-4)=9 \\ \\ 40*x-5-28*x+7 + 8*x-32=9 \\ \\ 40*x-20*x=9-2 \\ \\ 20*x=8 \\ \\ x=8/20 \\ \\ x=0.4 \\ [/latex]