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Sagot :

VINS

bonsoir

f (x) =  x + 7

f ( 6) = 6 +  7 = 13

x + 7 =  8

x = 8 - 7

x = 1

f ( - 40 ) = - 40 + 7 = - 33

x + 7  = 1

x = 1 - 7

x = - 6

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