$12x^2+36x^2+27x$
$x+\left(x-6\right)=90$
$2^3\cdot\left(2^2\right)^4$
$\frac{dy}{dx}+\left(4\left(e^{-4x}+1\right)-4\right)=0$
$\left(2a\right)\left(ab\right)\left(-7ab^4\right)$
$\lim_{x\to1}\left(x^2-3x-4\right)$
$-4\left(w+4\right)=2w+20$
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