Réponse :
soit l'équation:
((1/3b-2)*2=(5-1/2b)/4 <=> ((1/3b-2)*2)*4 = (5 - 1/2b)
<=> 8(1/3b - 2) = 5 - 1/2b
<=> (8/3)b - 16 = 5 -1/2b
<=> (8/3)b + (1/2)b = 5 + 16
<=> [(2*8 + 3*1)/(3*2)]b = 21
<=> ((16 +3)/6)b = 21
<=> (19/6)b = 21
<=> b = 21/(19/6)
<=> b = (21*6)/19
<=> b = 126/19
j'espère avoir aidé
