5 * 7 * x * x * x
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25x + 35x + 9 is 60x + 9, which factors to 3(20x + 3)
I'm guessing that's 35x^2 + 26x - 16 which factors to (5x - 2)(7x + 8)
(5x - 7)(7x + 5)
One is the only factor of 50 that is a cube.
35x + 115 = 360 35x = 360-115 35x = 245 x = 245/35 x = 7