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OI-codes/Luogu/B2006/B2006.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
int x, a, y, b;
cin >> x >> a >> y >> b;
cout << fixed << setprecision(2) << 1.00 * (b * y - a * x) / (b - a) << endl;
return 0;
}