$2\left(\frac{2}{5}x+4\right)=2\frac{2}{5}x+8$
$x + 3 = \sqrt { 3 x - 1 }$
$\lim_{x\to\infty}\:-2x$
$5x^2+200x+750$
$1+x+\frac{x\left(x^n-1\right)}{x-1}$
$\int\frac{\left(x^2\right)}{\left(49+x^2\right)^2}dx$
$10x-10-6\left(x+2\right)$
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