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Pre Calculus 12

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Im going over my pre calculus 12 exam, and I need help with one question from the chapter Transformations of graphs and stuff.

Combining Transformations

2y = f(5x-10)+8

The original points are (4,6) and the new points I got by translating it and stuff are : (14/5,20) But in the answer it says (29/5, 7)I have no idea how to get that :| Since there is 2y on the left side, I would divide by 2 to get rid of it, and I would do the same on the other side, which would give me..

y = 1/2f(5(x-2))+8

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