$87.6\cdot31$
$4^3xn-8y$
$\left(3x^2-5x+7\right)+\left(-8x^2+9\right)$
$\frac{dy}{dx}=0.27-\frac{y}{15}$
$-4xy^2y-12xz$
$x^2+10x+9=x-1$
$-9x^7-18x^4-27x^3$
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