$\frac{x}{x\left(x-2\right)}$
$3x-x^3-4x+5+x^34x^2-6$
$\left(-2a^4\right)\left(2a^2\right)\left(-5a\right)$
$\frac{9x-x^2}{5x-3}$
$-30\cdot\left(-20\right)\cdot5\cdot\left(-1\right)\:$
$\left(\frac{7z^4}{9}\right)^2$
$x^2+4x+4=4$
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