$x^2+y^2+16=0$
$\left(1100-135\right)+\left(680-75\right)+\left(800-12\right)-267$
$\left(x-z\right)2\:$
$\frac{6x^{4}+7x^{3}-3x^{2}-4x+6}{3x^{2}+2x-1}$
$-49x^2+392x-768$
$\left(3n\cdot4n^3\right)^2$
$\left(2y^{-1}\right)^3\cdot xy$
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