$\log_x\left(14x-45\right)=2$
$\left(x^2+4x-12\right)-\left(x^3-5y+13\right)$
$r\left(5+2r\right)-5-2r$
$x^2=49-z$
$9a^2+9b^2$
$\left(b^2+\frac{1}{2}\right)^2$
$2x^2y\cdot3xy^4\cdot8x^2y$
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