$4a^2-12ad+9a^2$
$-6\::\:-2$
$4a^4+8a^2a^2+9b^4$
$c-3c+c+6c+c-c$
$xy^'+4y=x^3-x$
$4x^2+2x-8=4x^2-5x+6$
$\left(x^{-\frac{1}{3}}\right)$
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