#include<iostream>
#include<cmath>
using namespace std;
long long x,y,z,p,ans;
void work(int &x,int &y)
{
	for(int i=2;i<=sqrt(x)&&i<=sqrt(y);i++)
	{
		if(x%i==0&&y%i==0)
		{
			x/=i;
			y/=i;
			work(x,y);
			break;
		}
	}
}
int main()
{
	while(scanf("%d %d %d %d",&x,&y,&z,&p)==4)
	{
		if(x==z&&y==p)
		cout<<"Error"<<endl;
		else
		{
			int k2=p-y,k1=z-x;
			if(abs(k2)%abs(k1)==0)
			{
			    ans=k2/k1;
			    cout<<"y=";
				if(ans==-1)
				cout<<"-";
				else if(ans!=1)
				cout<<ans;
				cout<<"x";
			}
			work(k1,k2);
			if(abs(k2)%abs(k1)!=0) cout<<"y="<<k1<<"/"<<k2<<"x";
			int t=y-(x*k1/k2);
			if(t>0)
			cout<<"+"<<t<<endl;
			else cout<<"t"<<endl;
		}
	}
	return 0;
}