Переносим
X^2 - x - 12 = 0
По Виета :
X1+X2=1
X1*X2=-12
X1=4
X2=-3
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Переносим
X^2 - x - 12 = 0
По Виета :
X1+X2=1
X1*X2=-12
X1=4
X2=-3