Question

Os valores de x que satisfazem a igualdade (12/3x-1)=(12/x+1 são:

a)1e4  c)3e4
b)1e3  d)2e3

Answer 1

$(^1^2\ _3_x_-_1) = (^1^2\ _x_+_1)\\\\\ 3x-1+x+1 = 12\\\\\ 4x = 12\\\\ \boxed{x=3}\\\\ 3x-1=x+1\\\\ 3x-x = 1+1\\\\ 2x=2\\\\ \boxed{x=1}$

Letra B) 1 e 3