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Anonymous
15=8x^2-14x
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x2 + 8x + 15 = (x + 3)(x + 5)
x² + 8x + 15 = (x + 5)(x + 3)
x=5
That heavily depends on the value of 'x'.
If the equasion is 12x+6-8x-4x-3+12 then the answer is 15.