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Sagot :

3x + 5 + 5x + 3 + 4 = 25

8x + 12 = 25

8x = 25-12

8x = 13

x = 13/8

Réponse:

(3x+5)+(5x+3)+4=25

3x+5+5x+3+4=25

3x+5x+5+3+4=25

8x+12=25

x=25-12/8=13/8=1.625

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