$-7+6y-8+4y$
$\frac{4}{1}-2$
$10-2\times51$
$5\frac{dy}{dx}-15xy=3x$
$2x-4\ge6x-5x-5$
$-4x^2+19x-21=-7x^2+34x-33$
$81h^2-16k^6$
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