$-3+5-7-3+7-5+1$
$4x^3\cdot7x^6$
$\left|6-\left(-1\right)\right|$
$x^2-2x+0$
$\frac{x^{-2}}{z^{-2}}$
$1+\frac{49}{4}-\frac{25}{4}$
$6\cdot4^2-4^3$
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