6m-5n-11
6*3-5*1.5-11=18-7.5-11=-0.5
7m+3n-m-8n-11 = 7m-m+3n-8n-11 = 6m-5n-11, m=3, n=1.5
6*3-5*1.5 -11 = 18-7.5-11 = -0.5
6m-5n-11
6*3-5*1.5-11=18-7.5-11=-0.5
7m+3n-m-8n-11 = 7m-m+3n-8n-11 = 6m-5n-11, m=3, n=1.5
6*3-5*1.5 -11 = 18-7.5-11 = -0.5