Philip P. answered • 09/20/14

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The 6 pictures together are 6*13 = 78 inches wide. The wall is 136 inches wide, so you have 136 - 78 = 58 inches of blank wall. You have seven gaps, five between the 6 pictures and two on either end.

(58 inches)/(7 gaps) ≅ 8.3 inches per gap

The first picture is places 8.3 inches from the wall on the left; there is a gap of 8.3 inches between each picture, and the last picture is 8.3 inches from the wall on the right.