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Meilleure réponse !
2014-04-02T14:39:45+02:00

1)4x=36

x= 36/4

x=9

2)3y=-21

y = -21/3

y= -7

3)18=-4a

a = -18/4

a = -9/2

4)4sur5m=2sur 3 

4/5 m = 2/3

m = 2/3 * 5/4

m = 1/3 * 5/2

m = 5/6

2014-04-02T14:41:00+02:00
4x=36  =>  x=36/4  =>  x=9

3y=-21  =>  y=-21/3  =>  y=-7

18=-4a  =>  y=18/-4=a  =>  9/-2=y