$11x\cdot4x^4$
$\left(7x^2-2\right)\left(7x^2+9\right)$
$\left(5w+z\right)^2$
$12^4\::\:\left(-4\right)^2$
$3x+4-\log\left(49^{\frac{2x-3}{\log\left(7\right)}}\right)=0$
$\lim_{x\to2}\left(x^2-4x+3\right)$
$y=\left(x+y\right)^2$
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