$\left(+700\right)\:-\:\left(130\right)\:-\:\left(-120\right)\:-\:\left(270\right)\:+\:\left(-180\right)$
$87+174+709$
$\left(\frac{7}{3}x+2\right)\left(\frac{7}{3}x-9\right)$
$2x\:a\:la\:3$
$-1+2-3+-5+6-7+8-9$
$20+_{-4\left(3^2-6\right)}$
$csc^4\left(x\right)-cot^{\text{4}}\left(x\right)=cot^2\left(x\right)+csc^2\left(x\right)$
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