How can I space the lines in the whole document ?

  • Welcome to TeX SE! It depends on your document class which is why we need a Minimal Working Example. For the regular classes, use the setspace package. – cfr Jul 29 '14 at 12:44
  • Also tex.stackexchange.com/questions/79046/…. – cfr Jul 29 '14 at 12:49

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