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{ * }^(2) - 4x = 0

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{x }^(2) - 4x = 0

x( x - 4) = 0

x = 0 \: \: \:and \: \: \: x - 4 = 0

x = 0 \: \: \: and \: \: \: x = 4
So the answers are x = 0 v x = 4
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