$\frac{x^{14}-1}{x^2-1}$
$-\left(10k+6.2\right)$
$x^2-3x+8=0$
$28-\left|\left(7-2\right)\cdot\left(15-21\right)\right|+6\cdot\left(-4\right)$
$\left(y-xy\right)\left(y\right)^'-y^2+1=0$
$8.76-8.67-8.6$
$2152+28$
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