http://stackoverflow.com/questions/1743698/r-eval-expression eval() evaluates an expression, but "5+5" is a string, not an expression. So, use parse() with text= to translate the string to an expression:
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math | Mathematics > math | R >
ANIBAL Updated Apr 1, 2018, 6:30 PM test | Use template |
math | Mathematics > math | R >
math.r | Eval
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