(e-4 8/11)+1 9/11=7 3/11е - 4 8/11 = 7 3/11 - 1 9/11
е - 52/11 = 80/11 - 20/11
е - 52/11 = 60/11
е = 60/11 + 52/11
е = 112/11
е = 10 2/11
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(10 2/11 - 4 8/11) + 1 9/11 = 7 3/11
(112/11 - 52/11) + 20/11 = 80/11
60/11 + 20/11 = 80/11
80/11 = 80/11
7 3/11 = 7 3/11