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Sagot :

5x+2=4x+2.8

5x+2-2=4x+2.8-2

5x=4x+0.8

5x-4x=4x+0.8-4x

x=0.8

5*0.8=4

4+2=6

0.8*4= 3.2

3.2+2.8=6

Un soda coute bien donc 80 centime

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