code: function negativeCoefficient(node) {
    if (NodeType.isConstant(node)) {
      node = NodeCreator.constant(0 - parseFloat(node.value));
    }
    else {
      const numeratorValue = 0 - parseFloat(node.args[0].value);
      node.args[0] = NodeCreator.constant(numeratorValue);
    }
    return node;
  }
docs: Multiplies `node`, a constant or fraction of two constant nodes, by -1 Returns a node