$ux-uy+u=0$
$6x^2-9x=9x^2-15x$
$\frac{4\left(x+2\right)-3\left(x-5\right)}{x+5}$
$x^2+2x=35$
$\sqrt{75x^3y^6z^4}$
$\frac{cos\left(a+b\right)}{cos\left(a\right)+cos\left(b\right)}$
$2x^3-2x^2-5x$
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