$\frac{-2x^4}{-5+x^2}$
$x-9=-11$
$15\:+\:\left(-\:8\right)\:+\:\left(-\:9\right)\:+\:\left(-\:10\right)\:+\:\left(-\:12\right)\:+\:\left(-\:13\right)\:+\:\left(-\:14\right)\:$
$3x\left(-8\right)+\left(-5\right)-\left(-4\right)-\left(+7\right)$
$100-\:4y^2$
$-7x^2-7x-13=8$
$+1-+50$
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