(6/7х - 1/5) · 5/8 = 5/8
6/7х - 1/5 = 5/8 : 5/8
6/7х - 1/5 = 1
6/7х = 1 + 1/5
6/7х = 6/5
х = 6/5 : 6/7
х = 6/5 · 7/6
х = 7/5
х = 1 целая 2/5
х = 1,4 - в десятичных дробях
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Проверка:
(6/7 · 7/5 - 1/5) · 5/8 = 5/8
(6/5 - 1/5) · 5/8 = 5/8
5/5 · 5/8 = 5/8
1 · 5/8 = 5/8
