Réponse:
1)
6(x+3)-2(x-1)=0
6x+3*6-2x-2*(-1)=0
6x-2x+18+2=0
4x+20=0
4x= -20
x= -20/4 = -5
2)
(4+3x)/5 = (7x-1)/8
(4+3x)/5 - (7x-1)/8 = 0
(4+3x)×8/40 - (7x-1)*5/40 = 0
(32+24x)/40 - (35x-5)/40 =0
[(32+24x)-(35x-5)] /40 = 0
(37-11x)/40 = 0
37-11x = 40*0
37 = 11x
37/11 = x
