$xy'\:=\:\left(x+1\right)e^{-y}$
$\left(5x^2-7xy\right)^2$
$\left[\left(-19\right)\:-\:\left(-4\right)\right]\:-\:\left[\left(-18\right)\:-\:\left(-6\right)\right]$
$2m^5g^{11}^6$
$-6\left(-2x^4+6\right)^5-22x^{\frac{15}{11}}$
$10+\left(-1\right)$
$324\cdot7$
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