$2a\left(a^3-2\right)$
$-2\cdot200$
$\log\left(x^2-1\right)-\log\left(x+1\right)=1$
$3y^2-9x-12$
$mx+my-x-y$
$\int z^3e^zdx$
$13+7y-6+3y-y$
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