$7x+30\ge-8$
$\left(x+2\right)\left(x^2-2x+4\right)-16$
$\left(\frac{2}{3}\right)^x\:.\:\left(\frac{4}{9}\right)^{-2x}\:.\:\left(\frac{8}{27}\right)^x$
$-4\sin\left(270\right)+2\cos^2\left(180\right)-7\cot\left(90\right)$
$\left(k-8\right)\left(k-2\right)$
$-am+6mn-45+6-am-5mn-25-5mn+3am$
$\frac{\left(5x^2-2\right)sinx}{sinx+6}$
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