$\frac{27x^3-1}{3x-1}-\frac{8x^3+1}{2x+1}$
$\left(4y^2+1\right)\left(4y^2-1\right)$
$281=48-w$
$-3+1-5+2$
$2\cos\left(4\pi x\right)+\sqrt{2}=0$
$15a-12b-5ad+4bd$
$\left(3x^2+2\right)\left(x-1\right)$
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