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$\sqrt{9x^2-5}-3x=-1$
$\frac{-12xy}{7y^4}.\frac{21x^5y^2}{4y}$
$\lim_{n\to\infty}\left(\frac{3^{n+2}}{\pi^n}\right)$
$\frac{5x^2+7x-3}{x+3}$
$\left(2c^3\right)^3$
$\frac{25x^6-5x^4+10x^2}{5x}$
$\sqrt[4]{\left(\left(-2.9\right)-2\right)\left(\left(-2.9\right)-3\right)}$
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