$\left(9a-25b^2\right)^2$
$2\:+\:4p\:-\:6p\:-\:3$
$-5x-4$
$\frac { x ^ { 2 } } { x ^ { - 5 } }$
$2y-y+7-1+3+7x^2-4y$
$27\cdot27\cdot27$
$\frac{27x-x^2}{9-x^.}$
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