$\lim_{x\to9}\left(\frac{\frac{1}{x}-\frac{1}{9}}{d-9}\right)$
$\left(7x+2y\right)\cdot\frac{dy}{dx}=-\left(2x+7y\right)$
$5x^2+20x-6$
$3x-9=3\left(-3+2x\right)$
$\lim_{x\to3}\left(\frac{x^3-3x^2+x-3}{x^2+3x}\right)$
$84^2-74^2$
$3x^2-4x+4=0$
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