3r/4+2r/1+r/2
3r/4+4x2r/4x1+r/2
3r/4+4x2r/4x1+r/2+2r/2x2
3r/4+8r/4x1+2r/2x2
3r+8r+2r/4
13r/4
13/4=r
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