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