Bonjour,
4x-7=21
4x= 21+7
4x=28
x= 28/4
x = 7
3x+18=15
3x= 15-18
3x= -3
x=-3/3
x= -1
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Bonjour,
4x-7=21
4x= 21+7
4x=28
x= 28/4
x = 7
3x+18=15
3x= 15-18
3x= -3
x=-3/3
x= -1