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How to make parentheses (with labels J1 and J2) as shown on the picture below?

Example of parentheses under math formulae

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You can use \underbrace:

a = \underbrace{a + b}_{=c}

creates

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Additionally, as stated in the comments, put the whole thing in braces to get the spacing before and after right:

a = x + {\underbrace{a + b}_{=c}}
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    +1. Hint: Enclose the entire underbrace expression in curly braces -- like {\underbrace{a + b}_{=c}} -- so that it'll be treated as a math-ord rather than as a math-op object. (This is relevant for the spacing before and after the underbrace expression.
    – Mico
    Mar 7 '16 at 16:51
  • +1 for this comment. Although the question was so basic, the terms math-ord and math-op are probably not understood... ;)
    – Dux
    Mar 7 '16 at 16:54

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