$\lim_{x\to0}\left(\frac{z}{3-\sqrt{z-9}}\right)$
$\frac{a^2-49}{a+7}$
$\lim_{x\to2}\left(3x^2-12\right)$
$70.0849+0.000002+0.0000015+0.000001+0.0000008+0.0000008$
$\int_3^4\left(23abx-17rbx\right)dx$
$a^2x^2-3bx^2+0^2y^2-3by2$
$2x^2-10x-1=0$
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