Ответ:
7
Объяснение:
(x+3)^2 - x^2 = 51
x^2+6x+9-x^2 = 51
6x = 42
x = 7
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Ответ:
7
Объяснение:
(x+3)^2 - x^2 = 51
x^2+6x+9-x^2 = 51
6x = 42
x = 7