$6a^3b-9aba+3b^7$
$z^2+10z+25$
$7a+14a^2$
$\sec a-\left(\sec a\right)\sin^2a$
$\frac{2}{5x}-\frac{1}{3y}$
$\left(+132\right)-\left(213\right)-\left(123\right)+\left(-498\right)$
$x^2-7x-60=0$
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