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#C#, 237 bytes

C#, 237 bytes

c=>{var b=1>0;var r="";int l=c.Length;var p=!b;for(int i=0;i<l;i++){int n=c[i];int e=l-1-i;var o=p&&i>0&&n>0?"+":n==-1&&e!=0?"-":"";p=n!=0?b:p;r+=n==0?"":o+(e==0?$"{n}":e==1?$"{n}x":n==1||n==-1?$"x^{e}":$"{n}x^{e}");}return r==""?"0":r;}

#C#, 237 bytes

c=>{var b=1>0;var r="";int l=c.Length;var p=!b;for(int i=0;i<l;i++){int n=c[i];int e=l-1-i;var o=p&&i>0&&n>0?"+":n==-1&&e!=0?"-":"";p=n!=0?b:p;r+=n==0?"":o+(e==0?$"{n}":e==1?$"{n}x":n==1||n==-1?$"x^{e}":$"{n}x^{e}");}return r==""?"0":r;}

C#, 237 bytes

c=>{var b=1>0;var r="";int l=c.Length;var p=!b;for(int i=0;i<l;i++){int n=c[i];int e=l-1-i;var o=p&&i>0&&n>0?"+":n==-1&&e!=0?"-":"";p=n!=0?b:p;r+=n==0?"":o+(e==0?$"{n}":e==1?$"{n}x":n==1||n==-1?$"x^{e}":$"{n}x^{e}");}return r==""?"0":r;}
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Romen
Romen
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#C#, 237 bytes

c=>{var b=1>0;var r="";int l=c.Length;var p=!b;for(int i=0;i<l;i++){int n=c[i];int e=l-1-i;var o=p&&i>0&&n>0?"+":n==-1&&e!=0?"-":"";p=n!=0?b:p;r+=n==0?"":o+(e==0?$"{n}":e==1?$"{n}x":n==1||n==-1?$"x^{e}":$"{n}x^{e}");}return r==""?"0":r;}