The operations $\bigtriangledown $ and $\bigtriangleup $ are defined as follows:
- $x \bigtriangledown y = x-3y$
- $x \bigtriangleup y = x(y-6)$
**Find $(-5 \bigtriangledown 0) \bigtriangleup 4$.**
[[☃ numeric-input 1]]
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