$\frac{\left(-4n^{3}b\right)}{10mn^{2}}$
$2x^3+x-3$
$\log_{2x-1}\left(4x^2-19\right)=2$
$\frac{1+k}{10}>1$
$8x^2y-3y\cdot2ax^3$
$3+\left|-15\right|+\left(-10\right)+\left|-35\right|+\left(-\left|-30\right|\right)$
$25-\left(-8\right)$
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