Lets say a= 34356466678672179216206944866734405838331831190171667647615530531663699592602
and b = 13499050790744142958256114571633334747886685252235001176113544924025382078422 and z = a*b but when i did z/a instead of giving me b it gave me something close to it 13499050790744143364768757356774188697457460003136632727580144822474986487808 why is that and how do i fix it in python

So let say i have this real number a,b,n and z and lets say z is gotten from ab-n so now i want to find b assuming i didn’t know it so i Change the formula to ab-n-z =0 so all i have to do here is to make b the subject of the formula which means to find b we do n+z/a but so instead of printing out the variables and checking if there were correct myself i did print(result==b) and it gave false and decided to print the value and i saw that was different from b so i wondered and wondered and still couldn’t see my error this is just simple maths so why didn’t it work any suggestions please

I am trying to rewrite several systems of equations in python, but I have little (very little) experience. I wrote something, but I don’t understand if it’s correct.
Can anyone help?