$2v^2+5v-7=0$
$7a^2b+5ab^2-6a^2b-8a^3$
$\lim_{x\to1}\left(\frac{1}{\ln\left(x\right)}.\frac{1}{x-1}\right)$
$34+8t\le90$
$4n^2-n-33$
$10\cdot80$
$\int\frac{1+e^{2x}}{4e^x}dx$
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