$\left(5x-9\right)^2$
$3\left(\frac{3x}{7}-1mn\right)$
$\int_e^{\sqrt{\left(x\right)}}dx$
$\sqrt[3]{a}.\sqrt[9]{a^3}$
$3x-5.2x-7$
$3.65+1.36+0.85+2.18$
$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
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