$\frac{4}{z-3}+\frac{3}{z-9}=\frac{z^2+4z-45}{\left(z-3\right)\left(z-9\right)}$
$10-5\left(9n-9\right)$
$\int\left(\frac{5}{x^6}\sin\left(\frac{1}{x^5}-1\right)\right)dx$
$\log_{11}\left(1-r\right)=\log_{11}\left(-3r-1\right)$
$4\cdot1-3$
$\int8e^{4y}dx$
$z=5x+2y$
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