$b\left(b+3\right)=5b+3$
$\frac{25-36^2}{5-6x}$
$\sin\left(2x\right)+2sin\left(x\right)-2cos\left(x\right)-2=0$
$\lim_{x\to4}\left(\frac{x^3-4x^2-x+4}{\sqrt[5]{x}-\sqrt[5]{4}}\right)$
$4+7+2-7-3$
$\:\left(x\:+\:9\right)\left(x\:+\:4\right)$
$\left(a^3-5a^2b-8ab^2\right)\left(-4a^4m^2\right)$
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