$\left(-2\right)\:-\:\left(-3\right)$
$\left(3+10\left(3-10\left(9\right)\right)-12\right)+10-30$
$-875+-365$
$2\left(x-5\right)+3\left(x+5\right)=20$
$3t^2-2t-7$
$\left(1-sinu\right)\left(1+sinu\right)=cos^2u$
$\left(e^2\right)^{-4}$
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