$\frac{\left(\sqrt[7]{x}-9\right)}{\sqrt[7]{x^6}}$
$\left(2-3\right)-\left(-4\right)$
$\left(-75\right)^4$
$\left(1-i\right)+\left(-1+3i\right)$
$\lim_{x\to0}\left(\frac{\left(3x+tan\left(3x\right)\right)}{4x-tan\left(2x\right)}\right)$
$\sqrt{7y+8}-\sqrt{6y+11}=0$
$-5mn\:-\:7pq\:-\:mn\:+\:3pq$
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