$\frac{d}{dx}8-\frac{2}{3}x$
$2\left(x+3\right)=2x+3$
$\left(16x-9y\right)^2$
$y^2x^2-y^2x$
$37x+-14y=14$
$\cos\left(\frac{\pi}{2}-x\right)=\frac{2}{7}$
$x^3-15^2+450$
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