Forums Scripts & Popups Math Help Please

Working on a @picwin listbox with scrollbar but having issues. How do I reverse this equation?(if it's correct at all)

F = First Item to display
T = Total items available for display(-25 to account for the current items displayed. Divided by the amount of pixels the thumb of the scrollbar can move)
S = Current Scrollbar Thumb Pos(-64 to account for the scrollbar not being at the top of the @picwin)

F = (T - 25) / 308 * (S - 64)
T = F / (S - 64) * 308 + 25
S = ?

Assuming the formula is F = ((T-25)/308)*(S-64) and not F = (T-25)/(308*(S-64))

T=(308*F/(S-64))+25
S=(308*F/(T-25))+64

:P

Yea, order of operations. Thank you