$7v-4v^2+-7+-10$
$\left(7x^4-9y^3\:\right)^2$
$5x^{-2}-14x^{-1}-3=0$
$\lim_{x\to1}\left(\frac{\sqrt[3]{2-x}-2}{1-\sqrt[6]{2-x}}\right)$
$7^6\cdot7^{-4}$
$\frac{3^{13}}{3^{11}}$
$2\log x-1=5$
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