Align objects horizontally with the Horizontal Alignment 
tools.
Align Left 
aligns all selected objects with the left edge of the object furthest to the left.
Shortcut
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Keys: Alt, D, AL, H, L
Align Center 
centers all selected objects horizontally relative to each other.
Shortcut
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Keys: Alt, D, AL, H, C
Align Right 
aligns all selected objects with the right edge of the object furthest to the right.
Shortcut
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Keys: Alt, D, AL, H, R
Distribute Horizontally 
aligns all selected objects to be equally spaced horizontally.
Shortcut
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Keys: Alt, D, AL, H, D