(15/18 + х) - 10/18 = 3/18
15/18 + х = 3/18 + 10/18
15/18 + х = 13/18
х = 13/18 - 15/18
х = - 2/18
х = - 1/9
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(15/18 + х) - 10/18 = 3/18
15/18 + х = 3/18 + 10/18
15/18 + х = 13/18
х = 13/18 - 15/18
х = - 2/18
х = - 1/9