I claim the ornamental design for an adjustable wall mounting system, substantially as shown and described.
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FIG. 1 is a front top right perspective view of an adjustable wall mounting unit, showing my new design;
FIG. 2 is a front left perspective view thereof;
FIG. 3 is a rear top right perspective view thereof;
FIG. 4 is a front bottom right perspective view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a left elevation view thereof, the right side being a mirror image thereto;
FIG. 7 is a rear elevation view thereof;
FIG. 8 is a bottom plan view thereof; the top side being a mirror image thereto; and,
FIG. 9 is a section view along the central line shown in FIG. 5.