$-4k^4+14+3k^2+\left(-3k^4-14k^2-8\right)$
$-5x+4y+7-10y$
$15n^3+12n$
$\frac{-x^3-6x^2+9x+8}{x+7}$
$\cos\left(a\right)+\tan\left(a\right)+\cot\left(a\right)=\frac{\cos\left(a\right)+1}{\sin\left(a\right)\cos\left(a\right)}$
$\left(x+7\right)y'=6y$
$\frac{x^2-9}{2x-4}$
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