Ответ:\(2x+2y=2(x+y)\);\(3a+3b=3(a+b)\);\(5m-5n=5(m-n)\);\(10p-5q=5(2p-q)\);\(12c+8d=4(3c+2d)\);\(15k-9l=3(5k-3l)\).