$4abc+b^2+\frac{abc}{2}-ac^2$
$\frac{x^2-x-2}{x-1}$
$\left(\frac{3x^5y^4}{x^0y^{-3}}\right)$
$-2\cdot0+2$
$\frac{2}{3}y^2+4y$
$-\frac{2}{2}+6-1$
$a^2-16ab+64b^2$
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