$-12\left(2n-3\right)-9\left(1-9n\right)$
$27x^4-51x^4+81x^4-27x^4$
$\left(s^2-6s+90\right)^2$
$\left(n^{-6}\right)^{-5}$
$\int\frac{\left(1+e^x\right)^2}{e^x}dx$
$\sin^2x+\cos\left(2x\right)=\cos^2x$
$3\left(x+2\right)-5\left(x-7\right)$
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