学步园

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
char ch[10001],al;
bool neg,alp,rev;
int a,b,t=1;
int main(){
	scanf("%s",ch+1);ch[strlen(ch+1)+1]='+';
	for(int i=1;i<=strlen(ch+1);i++){
		if(ch[i]=='-'||ch[i]=='+'||ch[i]=='='){
			if(rev)t=-t;
			if((i==1||ch[i-1]=='=')&&ch[i]=='-')neg=true;
			else{
				if(!neg)
					if(alp){a+=t;alp=false;t=1;}
					else{b+=t;t=1;}
				else
					if(alp){a-=t;alp=false;t=1;neg=false;}
					else{b-=t;t=1;neg=false;}
				if(ch[i]=='-')neg=true;
			}
			if(ch[i]=='=')rev=true;
		}
		else if(ch[i]>='0'&&ch[i]<='9'){
			t=(int)(ch[i]-'0');i++;
			while(ch[i]>='0'&&ch[i]<='9'){
				t=t*10+(int)(ch[i]-'0');i++;}
			i--;
		}
		else {alp=true;al=ch[i];}
	}
	if(b)printf("%c=%.3lf",al,(double)(-b)/(double)a);
	else printf("%c=0.000",al);
	return 0;
}