(1 5/6x+7/8):1 7/8=4 1/5-2 4/15
(1 5/6x+7/8):1 7/8=1 14/15
1 5/6x+7/8=1 14/15*1 7/8
1 5/6x=3 5/8-7/8
x=2 3/4:1 5/6
x=21/22
Ответ: 21/22.
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(1 5/6x+7/8):1 7/8=4 1/5-2 4/15
(1 5/6x+7/8):1 7/8=1 14/15
1 5/6x+7/8=1 14/15*1 7/8
1 5/6x=3 5/8-7/8
x=2 3/4:1 5/6
x=21/22
Ответ: 21/22.