$\frac{x-1}{2}-\frac{4-x}{4}$
$-x=23$
$45m^2n-20mn$
$\sqrt{3x+3}=0$
$\left(x^3+6y\right)^2$
$\left(3a^2+5b^5\right)^2$
$-5-6-2-\left(-8+9-4-7+8\right)-6+9-5$
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