$\left(7-3i\right)^4$
$\frac{x^2-81}{x+9}$
$6\::-8+5$
$a+\left[\left(-2a+3b\right)-\left(-a+b-c\right)-c\right]$
$11x+2<3$
$5^1\cdot5^0$
$y\:'=3\left(y+1\right)$
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