$13x-21>5-x$
$\left(y^{-1}+x^3\right)\left(y^{-1}-x^3\right)$
$28=-5x-7$
$-7\left(-2x\:+\:6\right)\:$
$\frac{d^2}{dx^2}\:\ln\left(sin\:\left(x\right)\right)$
$\left(3x^2+x-9\right)-\left(16x+14\right)$
$x^2\left(3y^3\right)x\:2\:$
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