$\left(2f\right)\left(-3f\right)$
$\left(1+\sqrt{x}\right)^4$
$3^1$
$7c=a\left(b-c+1\right)$
$\frac{90}{x^2+110x+1000}$
$\left(7x^{-4}+4x^{-3}+x\right)\left(2x^{-1}-8x\right)$
$5^2-60x+180$
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