5m(a+b)+a+b = 5m(a+b)+(a+b) = (a+b)(5m+1)
7a(m-3)-m+3 = 7a(m-3)-(m-3) = (m-3)(7a-1)
9y(c+d)-c-d = 9y(c+d)-(c+d) = (c+d)(9y-1)
5m(a+b)+a+b = 5m(a+b)+(a+b) = (a+b)(5m+1)
7a(m-3)-m+3 = 7a(m-3)-(m-3) = (m-3)(7a-1)
9y(c+d)-c-d = 9y(c+d)-(c+d) = (c+d)(9y-1)