$\frac{8a^3-1^3}{2a+1}$
$6x^2-13x-5=0$
$\left(2x+11x+23x+20\right)$
$\sin\left(-x\right)-\cos\left(-x\right)$
$-\left(380-150\right)$
$9x^2-8x+4$
$a^2+a-2>\frac{1}{2}$
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