Bonsoir, J'ai commencer cet exercice mais je n'arrive pas à comprendre, pouvez vous m'aider ?^^

1) x - 2(3x - 8) = 0
2) 4 - (x - 5)2 = 0
3) 49x2 - 42x + 9 = 0
4) 5x2 - 3 = x2 + 9
5) (8x + 5)(2x - 1)-(4x - 3)2 = 0​
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