Discussion
By factorizing algebraic expression cx + cy - dx - dy, answer will be
Answer: A
Group in pairs and factor each.
\[ cx + cy - dx - dy = c(x + y) - d(x + y) \]
\[ = (c - d)(x + y) \]
Taking out \( -d \) from the second pair turns \( -dx - dy \) into \( -d(x+y) \), matching the first bracket.
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