$121a^2b^2-286abc+169c^2$
$\left(-d^9\right)^5$
$a^2+a^2b+a^2^2c$
$8ab-15ab\:+3ab\:-ab\:+6ab$
$a^2-4ab^2$
$3x+5-2\left(x+4\right)+3$
$2.3\cdot1^2$
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