$-9\left(2f+1\right)+9\left(-3f+2\right)$
$3ab-1\cdot9a^2b^2+3a+1$
$\sqrt{49^4}$
$5^{2}\left(5^{3}\cdot5^{2}\right)$
$3\left(-t-6t^2-4\right)+3\left(-1+10t\right)$
$7.16-10009$
$x\left(x-2\right)=15$
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