Ответ:
9х-4х-3х=-40
2х=-40
х=-20
9х-4х=3х-40
5х=3х-40
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Ответ:
9х-4х-3х=-40
2х=-40
х=-20
Ответ:
9х-4х=3х-40
5х=3х-40
2х=-40
х=-20