$\left(8x-5\right)\left(8x+9\right)$
$7m^4+21m^3n+42m^2n^2$
$2^2\cdot2^2\cdot3^2\cdot3^2$
$\lim_{x\to0}\left(\frac{\ln\left(x\right)-x}{x\cdot\ln\left(x\right)}\right)$
$\frac{15x^2+1}{3x^2-2x+1}$
$\left(2w+9z\right)^2$
$-9+-2+-4\cdot6$
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