$18x^2-45x+27$
$-2x^2+4=-2x$
$-15wx-72wx$
$\left(3x-7\right)\left(9x^2+21x+49\right)$
$5x>10$
$\left(x^5-x^3\right)^2$
$\left(6p-2t\right)$
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