Answer:
[tex]=-39xy+24y[/tex]
Step-by-step explanation:
[tex]\mathrm{Multiply\:the\:numbers:}\:6\cdot \:2=12[/tex]
[tex]=12xy-3xy-24\cdot \:2xy+12\cdot \:2y\\\mathrm{Multiply\:the\:numbers:}\:24\cdot \:2=48\\=12xy-3xy-48xy+12\cdot \:2y\\\mathrm{Multiply\:the\:numbers:}\:12\cdot \:2=24\\=12xy-3xy-48xy+24y\\\mathrm{Add\:similar\:elements:}\:12xy-3xy-48xy=-39xy\\=-39xy+24y[/tex]