Bonjour,
3x+ 12= 2x +26 -x
3x-2x+12 =2x -2x +26 -x
x+12 = 26 -x
x+x +12 = 26-x+x
2x +12 = 26
2x+12 -12 = 26-12
2x = 26-12
2x = 14
x= 14/2
x= 7
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Bonjour,
3x+ 12= 2x +26 -x
3x-2x+12 =2x -2x +26 -x
x+12 = 26 -x
x+x +12 = 26-x+x
2x +12 = 26
2x+12 -12 = 26-12
2x = 26-12
2x = 14
x= 14/2
x= 7