$2\frac{dy}{dx}=3^{x+y}$
$\lim_{x\to7}\left(\frac{x^2-14x+49}{\sin\left(\pi x\right)^2}\right)$
$x+5=\frac{x+3}{3}$
$\frac{4y^3}{2y^2}$
$\left(\frac{2}{7}x+9\right)^3$
$2x^3-5x^2+2x$
$\left(x+3\right)-\frac{1}{2}$
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