$2x\left[2\right]+6x$
$x^2+20x>2400$
$-2^2\sqrt[9]{x^{27}}-2x^2-3x+\sqrt[4]{16}7\:$
$2cscx-2secx$
$2x-x+1$
$\left(-9\cdot6\right)+-4$
$4x^2-12xy+4y^2$
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