اكس تساوى

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 x=3.(4-x)/(4.(4-x)-3)

=(12-3x)/(16-4x-3)

(13-4x)x=12-3x

4x²-16x+12=0

x²-4x+3=0

x=1 obvious root

(x-1)(x-3)=0

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64

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