$-3-2-5+6+4+9$
$7y-4y+y$
$-t^2+8t+12$
$\frac{x}{1+x^3}$
$\int_{-1}^2\left(e^x\left(x+1+e^{-x}\right)\right)dx$
$\frac{e^x-e^x}{senx}$
$\left(8x+18\right)\left(8x-18\right)$
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