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13 11/13-12 12/13=12/13
6 6/25-5 8/25=23/25
25 3/17-18 4/17=6 16/17
6-1 3/4-10-2 3/5=4 1/4-10-2 3/5=-5 3/4-2 3/5=-5 15/20-2 12/20=
=-7 27/20=-8 7/20
8 5/7- x +3/4=6
-x=6-8 5/7-3/4
-x=-2 5/7-3/4
-x=-2 20/28-21/28
-x=-2 41/28 |*(-1)
x=2 41/28
x=3 13/28
spr.
8 5/7-x+3/4=6
8 20/28-3 13/28+21/28=6
5 7/28+21/28=6
6=6