$\frac{\left(0.46\cdot3\cdot10^8\frac{m}{s}\right)}{\left(3.10^8\frac{m}{s}\right)}$
$\left(21x^2-5x-4\right)$
$\frac{dy}{dx}=\frac{xy+y^2}{2x^2+xy}$
$6g-18f$
$100a^2-64b^2$
$8p+6q+15p$
$6\left(1-x\right)$
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