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Sagot :

Bonjour,

x(x-3)=4(x+1)(x-3)​

x²-3x=(4x+4)(x-3)

x²-3x=4x²-12x+4x-12

-3x=3x²-8x-12

12-3x=3x²-8x

12=3x²-8x+3x

12=3x²-5x

x=[3;-4/3]

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