4x + 7y - 3x + 5y
= (4x - 3x) (7y + 5y)
= (4 - 3)x (7 + 5)y
= 1x + 12y
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4x + 7y - 3x + 5y
= (4x - 3x) (7y + 5y)
= (4 - 3)x (7 + 5)y
= 1x + 12y