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5x4 – 7x3 – 5x2 + 5x + 1 = 0
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5x4 – 7x3 – 5x2 + 5x + 1 = 0

User Schaz
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6 votes
20 - 21 - 10 + 5x +1= 0
5x = 10
x = 2
User Miesje
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