$\left(2a^4\right)^3$
$x\cdot x+9x+18$
$5n^2+39n-54$
$5x-6+x\ge2x-8$
$m^8+18m^4+81$
$\left(a^2+2\right)\left(a^2+3\right)$
$18x^2y+x^2y-45x^3y^5$
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