How do you know if a mathematical statement is true or false?

if it works many times then its true





x + 4 =5


it has to be 1, it cant be 3 or 6 or anyother number than 1How do you know if a mathematical statement is true or false?
Normally, to check a statement is true or false. you check more than one sources, Like second person calculate it again.How do you know if a mathematical statement is true or false?
For true it depends. If it's like 4=4 then it's all real numbers.


For false you put No Solution/ N/A (no answer), or a 0 with a slash.