Répondre :
A= x-1 =1/6
x=1/6 +1 (6/6)
x= 5/6
B=3x-2=4/3
3x=4/3 + 2 (6/3)
3x= 10/3
x=10/3 * 1/3
x=10/9
C= 2/5x+1=4/5
2/5x= 4/5 -1 (5/5)
2/5x= -1/5
x=-1/5 * 5/2
x= -5/10 (-1/2)
D=3/7x+4=-8
3/7x=-8-4
3/7x=-12
x=-12 * 7/3
x= -84/3
x=1/6 +1 (6/6)
x= 5/6
B=3x-2=4/3
3x=4/3 + 2 (6/3)
3x= 10/3
x=10/3 * 1/3
x=10/9
C= 2/5x+1=4/5
2/5x= 4/5 -1 (5/5)
2/5x= -1/5
x=-1/5 * 5/2
x= -5/10 (-1/2)
D=3/7x+4=-8
3/7x=-8-4
3/7x=-12
x=-12 * 7/3
x= -84/3