$27+\left(-1\right)\:-\:\left(-27\right)\:$
$\sqrt[1]{1000\sqrt{4}}$
$351+764+153$
$\left(2\sqrt{x}+5\sqrt{y}\right)\left(2\sqrt{x}-5\sqrt{y}\right)$
$8y-18$
$5y^2-13y-6$
$6\left(c-f\right)$
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