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Sagot :

Bonjour,

A =45 +x

B= 1 000 - 5x

45 +x > 1 000 - 5x

x+5x > 1 000 -45

6x < 955

x > 955/6

x> 159,17

5+2x et x+9

5+2x  =   x+9

2x-x    =  9-5

x   = 4

5+ 8 = 4+9 = 13

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