$\frac{7}{3}^{-9}$
$11x-8-7\left(x-1\right)$
$\left(7+5x\right)\left(49-3x+25x^2\right)$
$350-87.5$
$\lim_{x\to-1}\left(3x\left(2x-1\right)\right)$
$-0.6\left(27\right)$
$tan\:x\:+\:sec\:x\left(sec\:x\:-\:tan\:x\right)$
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