$10,11+1,2$
$\frac{3-x^4+x^2-2}{x^2+1}$
$\frac{\sqrt{x\sqrt{x}}}{\sqrt[x]{x}}$
$2x^2-23x+63$
$7\cdot3+6$
$-3=x+5$
$x^3-27y^3$
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