Help with Javascript in a pdf form

Hi! guys, I have a question about Javascript programming for pdf forms.

I currently use the Adobe Pro DC, and I need to know how can I do 2 things:

1º I need to know how to make that an ACTIVATE Check Box149 subtract 2 from the result of Text99 (in turn Text99 is obtained from Text88 * 2) … Basically what I want is that the Text99 value variable, every time you activate a Check Box149, 150, 151, etc … will be subtracted 2 to the Text99.

2º The other question will come to see how we could...

Help with Javascript in a pdf form

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