$21-a=13$
$\left(6a^2-2b\right)^2$
$\frac{dy}{dx}=\frac{5x^2}{4t}$
$\frac{2x^3y^{-2}}{2x^2}$
$130-96+210-100$
$-10\left(16+18z\right)-4$
$9x^2-6x-5$
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