$\lim_{x\to0}\:x.\ln\left(3^x-1\right)$
$9x^3+4x^2+\left(-5x^3\right)+6x$
$x^2-6x-60$
$4\cdot49$
$\left(x^2-x-1\right)\left(2x-5x\right)$
$\left(\frac{-4y^3}{5}\right)^4$
$-\frac{80}{\left(-8\right)}$
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