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(10 1/7-у):1 1/7+2 5/8=7 1/8
(10 1/7 - y) : 1 1/7 + 2 5/8 = 7 1/8
(10 1/7 - y) : 1 1/7 = 7 1/8 - 2 5/8
(10 1/7 - y) : 1 1/7 = 6 9/8 - 2 5/8
(10 1/7 - y) : 1 1/7 = 4 4/8
10 1/7 - y = 4 1/2 * 1 1/7
10 1/7 -y = 9/2 * 8/7
10 1/7 - y = 9/2 * 4/7
10 1/7 - y = 36/7
10 1/7 -y = 5 1/7
y = 10 1/7 - 5 1/7
y = 5
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