$\left(6xy-5\right)^2$
$\frac { 9 x ^ { 2 } - 21 x + 12 } { 3 x - 2 }$
$\frac{log_b\left(k\right)}{log_b\left(9\right)}$
$3\left(x-5\right)^2$
$1+-5r-3r+9r$
$\lim_{x\to3}\left(\frac{x^2-6x+9}{x^2+6x-27}\right)$
$4\:+\:100m^2$
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