$10x-5y$
$\:\left(-\sqrt{x}+2\right)\left(\sqrt{x}+2\right)$
$12.9+675+23.03$
$\frac{30}{90}\left(21\right)$
$\left(4x-9\right)\left(4x+12\right)$
$\cos\left(a\right)\frac{4}{5}$
$7\left(x-5y\right)+3\left(2x+6y\right)$
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