$\frac{m^4n^4}{3m^4n^2}$
$x+2\left(x+1\right)=26$
$\lim_{x\to0}\left(\frac{7^x-2^x}{2x}\right)$
$2x+4y-5z=9$
$\lim_{x\to0}\left(3x^2\right)$
$\left(2x^2-2a\right)\cdot\left(2x^2+2a\right)$
$\int\frac{1}{3}\:e^{3x+1}\:dx$
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