$\left(\frac{1}{x}+\frac{3}{z}\right)^2$
$\left(7x^3+8x^3\right)^4$
$61-5+1$
$x^26x+9$
$8a+6v$
$\left(\frac{2}{3}a-3b\right)^2$
$\left(3ab^2-7mn\right)^3$
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