$1407+1752$
$\frac{x}{2yz}+\frac{2y}{9xz}-\frac{3z}{6xy}$
$3x-2y+5y-4x-3x+y$
$\left(2x^4+5x-3\right)+\left(4x-3x^2+2x^3\right)$
$\frac{\sqrt{7}}{\sqrt{5z}}$
$\log\left(x^2-1\right)-\log\left(x+1\right)=3$
$81m^6-54m^3n^2b+3b^2$
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