$4x+12=20$
$\frac{81x^4-16}{3x-2}$
$5^4x\:5^8$
$x+3>8$
$\left(7a^{-2}+5\right)\left(7a^{-2}-5\right)$
$x^2-2x+63$
$13+\left(22\right)+4+\left(-5\right)$
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