Reduce lowest term ax + bx - 2ay - 2by/ 4xy - 2x^2

i do not understand , please show steps. thanks

answer: a + b / 2x

Factor the numerator by grouping and the denominator by factoring out the common factor:
((a + b) (x - 2y)) / (-2x (x - 2y))
Cancel the common factor:
(a + b) / -2x