Ответ:\(5x+5y=5(x+y)\);\(4a-4b=4(a-b)\);\(3c+15d=3(c+5d)\);\(-6m-9n=-3(2m+3n)\);\(ax+ay=a(x+y)\);\(bc-bd=b(c-d)\);\(ab+a=a(b+1)\);\(cy-c=c(y-1)\);\(-ma-a=-a(m+1)\).