$9x^2+18+6$
$\:k^2-3k-180$
$\frac{25+36x^4}{5+6x^2}$
$\left(7w-4\right)^2$
$5\cdot\left(-1^4\right)$
$3x\frac{1}{4}$
$2879-579+753+978-897$
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