$x2+8x+17$
$\left(x^{b+1}\right)^2$
$\frac{6x^3+15x^2-14x-35}{2x+5}$
$\frac{x}{x-2}=\frac{2}{x+4}-\frac{2x}{x^2+2x-8}$
$-12303-111$
$2x^2+3x+1,\:x=1$
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