$-261+104-90$
$x^2-3x+170$
$\frac{x-7}{7-x}$
$\frac{x^2+2x\:-3}{x^2+1}$
$3z^2+18z+27$
$2 a ^ { 3 } ) ^ { 2 } \cdot ( 3 a ) ^ { 3 }$
$y^3-3\:y^3+15$
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