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Reverse this equation/function (2d to isometric)

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Okay so you have

    oiX = oX / 2 + Y * -1 * iH + iXo
    oiY = oY / 4 + X  / 2 * iH + iYo

Multiply by 2 or 4 to get rid of the divisions first

    2*oiX = oX - 2*Y * iH + 2*iXo
    4*oiY = oY + 2*X * iH + 4*iYo

Plug in the definitions of the origin and iso height and offset

    2*oiX = X*TW - 2*Y * TH/2 + 2*iW/2
    2*oiX = X*TW - Y * TH + iW
    2*oiX = X*128 - Y*128 + 64       (1)

    4*oiY = Y*TW + 2*X * TH/2
    4*oiY = Y*TW + X * TH
    4*oiY = Y*128 + X*128        (2)

If you add equations 1 and 2, the Y cancel and you get

    2*oiX + 4*oiY = X*256 + 64
    2*oiX + 4*oiY - 64 = X*256
    (oiX + 2*oiY - 32)/128 = X

If you subtract equations 1 and 2, the X cancel and you get

    2*oiX - 4*oiY = -Y*256 + 64
    2*oiX - 4*oiY - 64 = Y*-256
    (oiX - 2*oiY - 32)/-128 = Y

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