$9x+16=4x-19$
$\int_0^{1+i}\left(z^2\right)dx$
$\frac{-2}{2x^3}$
$4a^2-28a$
$4x^3-5^2-4x+5$
$\lim_{x\to\frac{\pi}{2}}\left(\sin\left(\frac{1}{2}\right)x-\cos\left(\frac{1}{2}\right)x\right)^2$
$2\sqrt{18x^3}$
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