code: def test_FracElement___neg__():
      F, x, y = field("x,y", QQ)
  
      f = (7 * x - 9) / y
      g = (-7 * x + 9) / y
  
      assert -f == g
      assert -g == f
  
imports: from sympy.polys.fields import field, sfield, FracField, FracElement
  from sympy.polys.rings import ring
  from sympy.polys.domains import ZZ, QQ
  from sympy.polys.orderings import lex
  from sympy.testing.pytest import raises, XFAIL
  from sympy.core import symbols, E
  from sympy.core.numbers import Rational
  from sympy.functions.elementary.exponential import exp, log
  from sympy.functions.elementary.miscellaneous import sqrt
label_desc: Use image node_id 11 for calling a global function with example usage: test_FracElement___neg__() without return types