`electron_charge = 1.6e-19`

The function rounds those small numbers to 0. Has anyone seen this? An example is below.

```
from sympy import *
x, y, z = symbols('x y z')
# this works because its only 1e-5
rslt = solve(Eq(0+1e-5, x), x)
rslt = rslt[0]
print rslt
#this outputs zero cause number is too small? :(
rslt = solve(Eq(0+1e-10, x), x)
rslt = rslt[0]
print rslt
```

]]>`electron_charge = 1.6e-19`

The function rounds those small numbers to 0. Has anyone seen this? An example is below.

```
from sympy import *
x, y, z = symbols('x y z')
# this works because its only 1e-5
rslt = solve(Eq(0+1e-5, x), x)
rslt = rslt[0]
print rslt
#this outputs zero cause number is too small? :(
rslt = solve(Eq(0+1e-10, x), x)
rslt = rslt[0]
print rslt
```

]]>`rational=False`

to the `solve`

call:
```
solve(Eq(1e-10, x), x, rational=False)
```

By default, sympy converts floats to rationals and apparently this causes precision issues (even though when I do `Float(Rational(1e-10))`

by hand I see no precision loss, but whatever).

@omz According to this discussion on Stack Overflow *something* related to this has been fixed in sympy 0.7.5, and Pythonista comes with 0.7.4.1. Might be worth updating if you haven't done so already internally.