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You need to find two factors of 5*672 = 3360, whoxe difference is 4: these are 56 and 60.

Then 5x2 - 4x - 672 = 5x2 - 60x + 56x - 672 = 5x(x - 12) + 56(x - 12)

= (x - 12)*(5x + 56)

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Q: How do you solve x for 5x 2-4x-672?
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