$7x^3+8x^2-10x-9x^2-2x$
$-x^2=-1$
$\left(2x\right)+\left(2x\right)-\left(5x\right)$
$\left(3a^{x-4}+b^{3x}\right)\left(3^{x-4}-b^{3x}\right)$
$-1\left(625\right)-1\left(256\right)-5\left(25\right)\left(16\right)-8+7\left(125\right)\left(4\right)+10\left(64\right)$
$\lim_{x\to\infty}\left(\cos\left(\frac{16}{x}\right)\right)^{x^2}$
$0=6x-\frac{48}{x^2}$
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