у = 27 -9х
27 -9х = у
у = 0
27 -9х = 0
-9х = -27
9х = 27
х = 27÷9
х = 3
Ответ: 3.
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у = 27 -9х
27 -9х = у
у = 0
27 -9х = 0
-9х = -27
9х = 27
х = 27÷9
х = 3
Ответ: 3.