so you want to add lik terms first group them together I have gropued the like terms using brackets [-2x+(x/4)]+[-6-3+90]=180 add lik terms add the number terms -6-3+90=81 [-2x+(x/4)]+[81]=180 subtract 81 from both sides -2x+(x/4)=99 add 2x to both sides x/4=99+2x multipliy both sides by 4 to clear fraction x=396+8x subtract 8x from both sides -7x=396 mulitply both sides by -1 7x=-396 divide both sides by 7 x=-396/7=-56 and 4/7
