$\frac{2a-3}{6}=\frac{2a}{3}+\frac{1}{2}$
$\left(3xy^3+9z^2\right)^2$
$5^{3-x}=125$
$\left(100+3s\right)a'+a=10$
$x^2-\frac{16}{3}x$
$\lim_{n\to\infty\:}\frac{\left(2\right)^{n+1}-1}{2^n+1}$
$-9n+21$
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