$-6x+25=73$
$\left(\frac{y+7}{3}\right)^2$
$6+2\cdot\left(-1\right)-9+15$
$\left(\frac{4}{7}x+1\right)^2$
$\left(20^r-5\right)\:\left(20^r+5\right)$
$5+9a-2a^2$
$\lim_{x\to a}\left(\frac{\sqrt{x}-\sqrt{a}}{x-a}\right)a>0$
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