j'aimerai savoir comment calculer-21=x+7-3x
-21=x+7-3x
-21-7 = -2x
2x = 28
x = 28/2
x = 14
-21-7=x-3x
-28=-2x
-28/-2=-2x/-2
14=x
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-21=x+7-3x
-21-7 = -2x
2x = 28
x = 28/2
x = 14
-21=x+7-3x
-21-7=x-3x
-28=-2x
-28/-2=-2x/-2
14=x