3х² + 9x = 0
3х * (х + 3) = 0,
3х = 0 х + 3 = 0,
х1 = 0 х2 = - 3
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3х² + 9x = 0
3х * (х + 3) = 0,
3х = 0 х + 3 = 0,
х1 = 0 х2 = - 3