Question

determine o valor de x na proporçao 1/3 =x-1/x+1

Answer 1

X+1= 3 (X-1)
X+1= 3X-3
-3X+X= -3-1
-2X= -4
X= -4/-2
X= 2

Answer 2

1/3 = x - 1 / x + 3
3(x - 1 ) = x + 1
3 x - 3 = x + 1
3 x - x = 1 + 3
2 x = 4
x = 4/2
x = 2