bonjour
f (x) = 5 x - 8
f (3) = 15 - 8 = 7
f (-4) = - 20 - 8 = - 28
f (2.4)= 12 - 8 = 4
5 x - 8 = - 17.4
5 x = - 17.4 + 8
5 x = - 9.4
x = - 1.88
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bonjour
f (x) = 5 x - 8
f (3) = 15 - 8 = 7
f (-4) = - 20 - 8 = - 28
f (2.4)= 12 - 8 = 4
5 x - 8 = - 17.4
5 x = - 17.4 + 8
5 x = - 9.4
x = - 1.88