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From WikiManual
Negate Operator UNARY
Places the negative of the top value of the stack on the stack.
-5 -
would place 5 on the stack.
5 -
places -5.
Negate Operator UNARY
Places the negative of the top value of the stack on the stack.
-5 -
would place 5 on the stack.
5 -
places -5.