$54-\left(21-38+\left(7-2\right)\cdot4\right)+5\cdot\left(27-4\cdot\left(15-4\cdot3\right)\right)\cdot4$
$4^5$
$7a-21b$
$-15x^3-18x+3$
$4b^2+28bc+49c^2$
$\left(-52\right)-\left(-67\right)$
$.\left(xy^3+10\right)\left(xy^3-10\right)$
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