$a^2-a-1$
$\int\frac{7+x}{7x+\frac{1}{2}x^2}dx$
$\left(2yx-7x\right)^2$
$x+y-3z=7$
$\frac{5x^5-2x^3+3x^2-2x+1}{x-2}$
$x+y^2=0$
$\left(81-36z^4\right)$
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