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If you wanted to find an exact match, you could try aideal = r · b; this makes the a / b fraction equal to r · b / b = r. That said, r · b might not be an integer (or even a rational number), so even without the added constraint, the approach is usually a bust.
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Asus is one of the world's most fun laptop companies. While Lenovo and HP make safe, corporate-friendly, boring hardware, Asus is unafraid to experiment — think dual screen laptops (the Zenbook Duo), or the light-as-a-feather, stiff-as-a-board Zenbook A16.