Which Two Terms in the Expression Are Like Terms $$5 x ^ { 2 } y - 3 y x ^ { 2 } + 7 y ^ { 2 } - 5 x y - 7 x ^ { 2 }$$

Which two terms in the expression are like terms?
$$5 x ^ { 2 } y - 3 y x ^ { 2 } + 7 y ^ { 2 } - 5 x y - 7 x ^ { 2 }$$