$-10.\left(-4-6\right)+9$
$\left(7x^{10}-\:8\right)^2$
$7\sqrt{7}\cdot2$
$10m-5mn+5md$
$\frac{x^2-5x+14}{x+2}$
$5x^4-3a^2+a^4+4a^4$
$3+n=-18$
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