х + х + (х + 2) + (х + 2) = 16
4х + 4 = 16
4х = 16 - 4
4х = 12
х = 12 : 4
х = 3
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х + х + (х + 2) + (х + 2) = 16
4х + 4 = 16
4х = 16 - 4
4х = 12
х = 12 : 4
х = 3