$y=\left(2x-x^2\right)^2$
$x-3=\frac{3}{2}x+3$
$\frac{\left(x^3-125\right)}{x^2+5\:x\:+25}$
$\frac{126x^4+81y^4}{2x+3y}$
$cos\left(x-\frac{\pi}{3}\right)=-1$
$-x^2-2x+2x^2$
$x^2-7x+2$
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