12 = (7x – 9) – (11 – x)
12 = 7х - 9 - 11 + х
7х - 9 -11 + х = 12
8х = 12 +9 +11
8х = 32 I : 8
х = 4
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12 = (7x – 9) – (11 – x)
12 = 7х - 9 - 11 + х
7х - 9 -11 + х = 12
8х = 12 +9 +11
8х = 32 I : 8
х = 4