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Factor completely: 3ab – 5ax + 9b − 15x?
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3ab-5ax+9b-15x
Factor by grouping, do the first two, and then the second two
3ab-5ax+9b-15x
a(3b-5x)+3(3b-5x)
(a+3)(3b-5x)
(3 + a) (3 b - 5 x)
(a+3)(3b-5x)