Question

determine o valor do termo deconhecido: 2/x+1=1/5

Answer 1

$\frac{2}{x+1}=\frac{1}{5}\\ \\ x+1=10\\ \\ x=10-1\\ \\ x=9$

Answer 2

  2       =   1
x + 1        5

2.5 = x + 1
10 = x + 1
10 - 1 = x
9 = x
x = 9