Наверное так:
3х * 9 = 5 * 6 + х
9х = 30 + х
9х - х = 30
8х = 30
х = 30/8
х = 3,75
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Наверное так:
3х * 9 = 5 * 6 + х
9х = 30 + х
9х - х = 30
8х = 30
х = 30/8
х = 3,75