In(x):2,10,___,__,__,-3,__,___,x

Out(y:4,28,13,-17,10,_,2.5,148,3x-2
What's the answer !!!! Help!! ASAP!

Take a look at the last terms: x and 3x-2

So, for all the other places where x is given, y = 3x-2

Where y is given, x = (y+2)/3

Now just fill in the blanks.