$7x^2+9x-130$
$\int 4 d x$
$\int_1^{\infty}\left(\frac{1}{\left(1+x^2\right)^2}\right)dx$
$\lim_{x\to1}\left(\frac{x^2+3x-4}{x^2-3x-2}\right)$
$6z^2-12z$
$y^2+3x^2+5=0$
$1+7-12+6-13+4-11$
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