$\frac{dy}{dx}x-y=1$
$18ft\cdot12in$
$\left(3x^4-\:y^2\right)^2$
$3x-2-6x^2-7x^2-3x$
$34-65+89+88-765$
$\frac{-4\sqrt{a+d}}{\sqrt{a}+\sqrt{d}}$
$x^2+4x-9\le4x^2-3x-7$
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