$\left(5x+6\right)+\left(4x-8\right)$
$-x+x+1$
$\frac{125z^9+x^{12}}{5z^3+x^4}$
$20\cdot19+-5\cdot7$
$169-x^2$
$z^2-30z+17=0$
$\frac{dy}{dx}=x\cos^2y$
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