x=0 says the answer is 0. An answer with no solution would be something like:
3=4 because its false.
If x=0 that means that there are infintive amounts of answers, because if you check any number (that is real) it will work in that equation.
Whooooaaa ....you better check that answer!
x+1 =1 has an answer of only '0' I cannot put ANY other number in there!
if you wind up with soemthing like 3= 3 then x can be about any number....