$-7.\:\:5\:.\:\left(\:-\:2\:+\:6\:\right)\:-\:2\:.\:\left(\:-\:5\:+\:9\:\right)\:$
$3p^3q\:-7pq^2+8pq$
$18:6-\left(7+4\right)-9-3-\left(5\cdot6\right)$
$\sec\left(z\right)\cdot\csc\left(z\right)$
$\left(\frac{-3x^2}{4y}\right)^2$
$4c^2-20c^6+42c$
$\left(21x^3-5x^2-4x\right)$
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