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5(x + 7)
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(5x - 7)(7x + 5)
9.2x+5x=35
-30
2x + 5x = 357x = 35x = 35/7x = 5
50x2 - 18Factor out the common factor of 2:= 2 (25x2 - 9)Factor the difference of two squares:= 2 (5x + 3) (5x - 3)