$\left|-153\:-\:-771\right|$
$-3\:-1\:-5\:+\:15\:-12$
$\left(3q-2r\right)^2$
$3t^2-6\sqrt[2]{3}t+9$
$\frac{x^3}{-2x^2}$
$\frac{a^5+1^5}{a+1}$
$- ( 7 n - 24 ) ^ { 2 }$
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