$\left(2z^7\right)^3\left(z^{-3}\right)$
$\frac{6\left(5\right)+5}{3\left(5\right)-8}$
$-41-98$
$2.5+y=-3.5$
$-9+\left\{-12+5-\left[8+\left(5-3\right)-2\right]+9\right\}$
$x^6+2x^5-5x^4$
$4sinx+8=8$
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