$-\left(8-3\right)-\left(4+2\right)-\left(3-\left(5+3-6\right)-4\right)$
$\frac{x^2}{49}+\frac{y^2}{64}$
$9n^2+c^2-6nc$
$\:x\:+\:420\:>\:612$
$\frac{49}{10}x\frac{25}{28}$
$\frac{x^2\cdot\left(xy^2\right)^4}{\left(2y^3\right)^0}$
$6^{-3}+6^7$
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