$3x^4-2x^3+6x-6\left(x^4-x^3-x^2+6\right)$
$0.15+0.15$
$x^2+x-2x^2+3x$
$\int_{-1}^1\left(\frac{e^x}{2}\right)dx$
$-3-\frac{4}{1}$
$\left(\frac{2}{3}x-3y\right)^3$
$2x-3\left(2x-3\right)$
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