$\sqrt[3]{\left(7x^2-2x^5\right)}$
$\left(4a^3b^5\right).\left(-\frac{1}{4}abc^2\right)$
$\frac{x-1}{x+2-\frac{x^2+2}{x-2}}$
$16x-8y-64$
$3+-2\cdot5$
$\frac{a^{12}}{a^7}$
$\left(-3^2\right)+189$
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