$\int\frac{2x-1}{x^2+1}dx$
$a-4\cdot3+a$
$\int_7^8\left(\frac{1}{\left(x-7^{\frac{3}{2}}\right)}\right)dx$
$\left(2w-5u\right)\left(2w+5u\right)$
$x+1<\:3\left(x+2\right)-2x$
$x^2-8x+13=0$
$s^2+4s-3$
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