$\sqrt{7}+2\sqrt{7}$
$-4+3-1-2-5-3$
$7sin\left(x\right)-4\sqrt{2}=-sin\left(x\right)$
$3x+4-5y+6x$
$6x+252x+3$
$\frac{d}{dx}\left(xy^2+4+y=-x^3\right)$
$\left(m+n\right)^2-\left(2m+n\right)^2+\left(m-4n\right)^2$
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