$-47-3-7+8-8$
$\left(a^4y^2\right)^{10}$
$\left(6n^{-1}\right)^3$
$\frac{y^6x^3}{y^6x^5}$
$\left\{\left(-2\right)-\left(-1\right)+\left[\left(+4\right).\left(-1\right)\right]\right\}$
$\lim_{x\to-4}\frac{\left|x+4\right|}{x^2-16}$
$x y - 21 x = 7 y - 8 x + 9$
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