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Meilleure réponse !
2014-09-16T18:21:06+02:00
A. 2/3x = 4
2/3x = 12/3
2x = 12
x = 12/2
x = 6

B. - 3x = 4
x = - 4/3

C. - 6x = 2/3
18x/3 = 2/3
18x = 2
x = 2/18

D. - f/3 = 2

D  - f/3 = 6/3
f = - 6