$\left(9.7x-1.5y\right)\left(0.7x+1.5y\right)$
$\left(x^2\:y^3\right)^{-7}$
$\frac{x^2-x+1}{2-x}\ge1$
$\int7^{6x}dx$
$\frac{42x^2+33}{7x+7}$
$x-x^{2}+x$
$\frac{k}{3}+17=12$
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