$x+x+x+4x$
$\left(-5^7\right)^6$
$y^3+sy^2$
$dy=x^4y^2dx$
$7xy+5zy-8yx-9yz$
$\lim_{n\to\infty}\left(\frac{3^n\cdot n+3^n-n-1}{3^{n+1}-1}\right)$
$\int\left(\frac{x^3-x+3}{2\sqrt{x}}\right)dx$
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