If the domain of the function
$$
f(x)=\log _{\left(10 x^2-17 x+7\right)}\left(18 x^2-11 x+1\right)
$$
is $(-\infty, a) \cup(b, c) \cup(d, \infty)-\{e\}$, then $90(a+b+c+d+e)$ equals:
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