Carthook not support the direct script tag on global code Here is the solution, You just need to change optimize code instead of 1234567 
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://www.googleoptimize.com/optimize.js?id=OPT-1234567';    
document.getElementsByTagName('head')[0].appendChild(script);
 

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