Ответ: y=16
Объяснение:
y^2+18y+81-y^2=369
18y+81=369
18y=369-81
18y-288
y=16
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Ответ: y=16
Объяснение:
y^2+18y+81-y^2=369
18y+81=369
18y=369-81
18y-288
y=16