$\frac{2x\:+y}{3}+x-y^2$
$275\cdot25$
$-\sqrt{-1}$
$\frac{x-3}{x}+\frac{2x+3}{x}$
$f ( t ) = \frac { 9 - t ^ { 2 } } { t - 3 }$
$3y^6+9y^2$
$-25\cdot50$
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