$20.6786-8.812\ln\:\left(27\right)$
$\left(4x+\frac{3}{7}\right)\left(4x-\frac{3}{7}\right)$
$x ^ { \frac { x } { x } }$
$11^4\cdot11^{-3}$
$\left(5x+2y^2\right)^2$
$\int\:\frac{5}{\left(-x^2+9\right)^{\frac{3}{2}}}dx$
$\left(1-x\right)dy=2\left(1+y\right)dx$
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