$3x^2y^2\cdot2x^{-1}$
$\frac{-9x^2+x^4+x-3}{x+3}$
$\left(5c^2\right)\left(5c^2\right)$
$-t^2+2t+15$
$45-56-58+74+23$
$\left(1-2a\right)^5$
$18-x>5$
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