$5^3\cdot5^{-2}$
$x^6-216$
$2\left(1-x\right)-2\left(x+2\right)<7$
$\frac{64-x^26}{4-x^22}$
$3\left(-8\right)+20$
$2.7\:\cdot\:7$
$2r+2r$
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