Question 938214

{{{(-3r+5(4s-5t))+4(-7r+18s+6t)}}}

{{{(-3r+5*4s-5*5t)+(4*(-7r)+4*18s+4*6t)}}}

{{{-3r+20s-25t-28r+72s+24t}}}

{{{72s+20s-3r-28r-25t+24t}}}

{{{92s-31r-t}}}