$x+2x-ax-x$
$\int5\left(e^{\frac{x}{3}}+e^{-\frac{x}{3}}\right)dx$
$20x^2-7x-120$
$\left(x^2+4x+8\right)\left(x^3-x^2-4x+8\right)$
$225-10w+55z$
$-6x^2+25x^2$
$3a^2+a-4$
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