$-7+2-4+3-8+1$
$3x+\frac{x}{2}$
$30-4.\left(5+2\right)$
$k2\:+\:9k\:+20\:$
$5x+1>5$
$\left(3a-10b\right)^2$
$\frac{\sin\left(x\right)\cos\left(x\right)}{\cos\left(x\right)\sin\left(x\right)}$
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