$4-15\cdot5$
$3x^2+x=10$
$\left(\frac{-48ab^{-1}}{-6a^3b^5}\right)^{-1}$
$\frac{dp}{dt}=3\left(20-p\right)$
$\frac{x^3-2x+4}{3x^2-1}$
$2x+1=x+9$
$12x^27^3-6xy^2$
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