$7-19+15-8+6-13-6$
$4x^3-2x^2-10x+6$
$\lim_{x\to\pi}\frac{\left(x-\pi\right)\cos\left(\frac{3\pi}{2}\right)-x}{\sec\left(x-\pi\right)-1}$
$7-\left(8+4\right)+6$
$y\sqrt{x}^21$
$20-1$
$\frac{81x^{12}-1}{3x^3+1}$
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