How can I make the page editor trust me?

To avoid the line break when posting 2 images side by side assign the alignleft or alignright class to them and put them on the same line in the editor without skipping any spaces between them.

Example:

<img src="https://wordpress.stackexchange.com/wp-content/uploads/your_image.jpg" alt="" class="alignleft" /><img src="/wp-content/uploads/your_image2.jpg" alt="" class="alignright" />

Edit
I forgot to mention that content after the floated images will overflow between the images unless you clear the floats. I add: <div class="clear">&nbsp;</div> after the images and add .clear {clear:both;} to my css.

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