(24 - х) + 51 = 2(х + 12)
24 - х +51 = 2х + 24
2х + х = 24 + 51 - 24
3х = 51
х = 51/3
х = 17
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(24 - х) + 51 = 2(х + 12)
24 - х +51 = 2х + 24
2х + х = 24 + 51 - 24
3х = 51
х = 51/3
х = 17