$n-1=a\left(n+1\right)+b\left(n\right)$
$25x^2+x-32x^2-7x$
$4qr^2-\:qr^2-2qr^2$
$\mathrm{sech}\left(\frac{1}{\cosh x}\right)=\left(\cosh\right)-1$
$\left(5+x^4\right)\frac{dy}{dx}=\frac{x^3}{y}$
$\sqrt[27]{97.2}$
$\:21\left(6x\right)^3\:\left(2y\right)^4$
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