$321-52-31$
$2\left|7x+3-x\right|$
$3 - 2 ( x - 1 ) \leq 2 ( 4 + x )$
$u^3.u.u^3$
$2\sin\left(a\right)\cos\left(a\right)$
$vector\:0.5d\:+\:1.2c\:$
$\left(3+\cos\left(2x\right)\right)$
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