Question

Determine o valor de n na equação (n-1) /(n+1) -n =1/81

Answer 1

$\frac{n-1}{(n+1)-n} = \frac{1}{81} \\\\ 81(n-1) = 1\left[(n+1)-n\right]\\\\ 81n-81 = \not{n}+1-\not{n}\\\\ 81n =81+1\\\\ \framebox[1.1\width]{ \quad n = \frac{82}{81} \quad } \par$