$5a-\left[-3b-\left(2a+4b-c\right)+4c\right]$
$\left(3x^4-y\right)^4$
$3c^4\cdot3$
$\left(\left(2x-9\right)\right)^2$
$5\cdot\left(-12\right)\cdot\left(-3\right)$
$\sqrt{54x^2y^5}$
$18+x=27$
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