$\frac{x^4-4x^3+4x^2+2}{x^2-x}$
$\frac{x^2+x-2}{x^3-x+3}$
$-7x\left(-9x^2+4\right)$
$\int4xln\left(3x\right)dx$
$b^3.a^2.c^2.b^4.a.c^3$
$-x^3+x^2+48$
$\frac{45z^{21}}{81z^{16}}$
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