$-a^2b-3a^2b-9a^2$
$6x^2-7x-3=0$
$-\left(2+\frac{4i}{n}\right)^4$
$-100-6500$
$-3\left(3f+9\right)+\frac{1}{2}\left(2g-8\right)$
$\lim_{x\to0}\left(\frac{e^{4x-4}-x^4}{3x^5-5x^3+2}\right)$
$\left(\frac{1}{2}a+3\right)$
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