$3a+2b-\left(a+b\right)-\left(-2a+3b\right)$
$\lim_{x\to3}\left(\frac{x^2-2x-18}{x-3}\right)$
$\int\left(\frac{3}{\left(x+2\right)^{\frac{3}{7}}}\right)dx$
$3\left(\tan\left(30\right)^2\right)+\cot2\left(30\right)-3=0$
$12-\frac{1}{3}u=2$
$9x-7y=-7$
$16m^4\:+\:40m^2\:n^3\:+\:25n^6$
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