July 2022 1 6 Report
помогите срочьно решить уравнение у меня 20мин. вот уравнения

1)х2 +6х+9=0,
2)х2-6х=5х-12-х2,
3)3х2-х+21=5х2.
СПАСИБООООО!!!!!!!!!!!!!
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