Ответ:
69 - (169 - 26y + y^2) = - y^2
69 - 169 + 26y - y^2 + y^2 = 0
26y - 100 = 0
26y = 100
y = 50/13
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Ответ:
69 - (169 - 26y + y^2) = - y^2
69 - 169 + 26y - y^2 + y^2 = 0
26y - 100 = 0
26y = 100
y = 50/13