$a^2-24a+49$
$\left(-1\right)\:x\:\left(2\right)\:x\:\left(-1\right)\:x\:\left(-2\right)\:x\:\left(-1\right)\:$
$\sqrt{5\sqrt{y^{17}}}$
$\frac{3}{4}x\frac{16}{20}$
$\left(3y+7\right)\left(3y-4\right)$
$6x\:-\:12\:<\:6\:+\:3x$
$\frac{1119x^2y^9}{35x^2}$
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