Answer :

luana
[tex]8(c-9)=6(2c-12)-4c\ \ \ \ | omiting\ the\ brackets\\\\ 8c-72=12c-72-4c\ \ \ \ | addition\ of\ similar\ numbers\\\\ 8c-72=8c-72\\\\ 0=0\\\\There\ are\ infinitely\ many\ solutions.[/tex]