$-\frac{15}{7}a-\frac{6}{7}a$
$\left(6x-5\right)\left(6x-20\right)$
$\frac{d}{dx}\sqrt{2x^2-23}\:$
$\frac{\left(10x^3-15x+20x^4\right)}{\left(-5x^2\right)}$
$\left(-w^3+8w^2-3w\right)+\left(-8w^2+w+3\right)$
$x^8-2x^4+x=0$
$\left(\:5x\:-\:13\right)\:\left(\:5x\:+\:13\right)$
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