如果存在图像，请调整分隔宽度

I have a divider with float left property housing some text, then divider float right housing an image. Total width of both dividers should be no bigger than 735 and I am reserving 200 for image. How can I adjust the width of the first divider to be 535 if image is present and 735 if image is hidden?I have a divider with float left property housi