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New operator definitions 2

The operations ▽\bigtriangledown and △\bigtriangleup are defined as follows:
  • x▽y=x−3yx \bigtriangledown y = x-3y
  • x△y=x(y−6)x \bigtriangleup y = x(y-6)
Find (−5▽0)△4(-5 \bigtriangledown 0) \bigtriangleup 4.
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}