$21,25\:\cdot2$
$\lim_{t\to x}\left(-\frac{5}{\left(x-7\right)^2}\right)$
$15ab+30a-45$
$\left(-2x-y+5z\right)-\left(5x+6y-7z\right)$
$w=\frac{b^2}{a^3}.......b=x^2\frac{-2}{y^2}....b=2xy^3$
$1=17x-26y$
$6^{-6}\cdot6^7$
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