$7-\left(-19\right)-18\left(-19\right)+18$
$-5x^7\left(6x^9+3x^5+3x^3\right)$
$\left(7x+y^{2}\right)^{3}$
$30.97-17$
$x^2\:+\:x\:>12$
$-3\:x\:-2\:x\:-1$
$x^2+12x+45$
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