$6a-\left(-9\right)a$
$\left(a^2-a+b^2\right)\left(a^2+ab+b^2\right)$
$t\:\frac{-4}{-8}$
$\left(5x^2+2\right)^3$
$2x\:+\:5=\:3\:\cdot\:\left(2x\:-\:1\right)$
$x^4+8x^2+16-4x^2$
$7-6-1+4x$
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