$6\left(k+5\right)-6$
$\frac{x^4-3x^3-3x^2+5x+1}{x^2-4x-1}$
$\frac{dy}{dx}=\frac{-4x^2+6x+3}{-4y^2-4y-1}$
$-7\cdot\left(-5+7\right)+\left(-8+7\right)$
$\int_1^{ln\left(x\right)}sin\left(t\right)dx$
$\frac{4x^2-2x^2+8x}{2x^2-3x+7}$
$4x+3<2x+7$
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