$\left(-3x^2y\right)\left(x^2+4xy+y^2\right)$
$\frac{x^4+4x^3-4x^2-5}{x-2}$
$\log4+\log x=\log\left(7x+3\right)$
$\left(4^{-3}\right)^5\left(4\:x\:4^2\right)^4$
$\lim_{x\to0}\left(\frac{e^{3x}-2x-1}{sin^2\left(2x\right)}\right)$
$4x=64$
$\frac{x^3-7x+6}{x-3}$
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