After Effects Linear Expression Error: undefined value used in expression

Created an expression slider to control an object's scale. I worte this code and have no idea where's wrong.

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Correct answer Dan Ebberts

In your second line, replace the square brackets with parens, like this:

var a = linear(x, 0, 100, 0, 60);

Correct answer

Community Expert

In your second line, replace the square brackets with parens, like this:

var a = linear(x, 0, 100, 0, 60);

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