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Unique (old) Number System™ | United States America (US)
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x² - 13x + 42 = x(x-13) + 42 it will always be even for any +ve integeral value of x.

x² - 13x + 42 = x(x-13) + 42 it will always be even for any +ve integeral value of x.


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Unique (old) Number System™




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