$10x+6y-3x+2y$
$\frac{d}{dy}\left(\frac{1}{2}+8xy\right)$
$xy^2+y^2=7$
$\frac{3x^4+4x^3+2x^2-10x+7}{3x^2-5x-2}$
$3x^3y-9x^3$
$\left(7x^2+4x^4\right)\cdot\left(7x^2-4x^4\right)$
$-4\left(\sqrt{2-x}-1\right)$
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