$\left(8-a\right)^3$
$3x^2-6x-10$
$\left(-5\right)\:-\:\left(-19\right)$
$15x^2-23x^2+4$
$8a+5.2^b-7.1^a+6.4^b+9a$
$-x^2+6x-8$
$m^2\left(-7mn+\left(n^2-\left(m^2-3mn+2n^2\right)\right)\right)$
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