$5-7\left(-2n+8\right)$
$\frac{dx}{dy}=-x=2y^2$
$\left(11x^7y^2\right)\left(3x^7y\right)$
$x+4=8$
$a4+18a^2+81$
$3x^2y^4+7x^4y^5-8x^5y^3$
$\lim_{x\to\infty}\left(\frac{2x+1}{x+2}\right)^{\frac{1}{x-1}}$
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