$\left(6n^4-9n\:+\:2\right)-\left(-5n^7+17n^4+5\right)$
$\left(-7\right)\:.\:\left(-7\right)\:.\:\left(-2\right)\:$
$2a^2+11a-21=0$
$\left(81a\right)^{\frac{1}{4}}$
$\left(-\frac{4}{5}a^2b\right)\left(-ab\right)$
$f\left(x\right)=x^3-18x^2+2x$
$8z^2+10z-3=0$
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