1) 2m(a+b)+a+b = 2m(a+b)+(a+b) = (a+b)(2m+1)
2) 4x(m+n)-m-n = 4x(m+n)-(m+n) = (m+n)(4x-1)
3) 5x(a+b)-a-b = 5x(a+b)-(a+b) = (a+b)(5x-1)
4) 3m(x+y)-x-y = 3m(x+y)-(x+y) = (x+y)(3m-1)
1) 2m(a+b)+a+b = 2m(a+b)+(a+b) = (a+b)(2m+1)
2) 4x(m+n)-m-n = 4x(m+n)-(m+n) = (m+n)(4x-1)
3) 5x(a+b)-a-b = 5x(a+b)-(a+b) = (a+b)(5x-1)
4) 3m(x+y)-x-y = 3m(x+y)-(x+y) = (x+y)(3m-1)