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For the algebraic expression: `28*x+74`

Identify the variable(s)  
Identify the constant(s)

Enter your answer as a list separated by commas if necessary.

X
MathQuill
   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
[more..]