Solve the Equation $\frac { 10 ^ { x } - 31 \cdot 10 ^ { - x } } { 5 } = 6$

Multiple Choice

Solve the equation.
- $\frac { 10 ^ { x } - 31 \cdot 10 ^ { - x } } { 5 } = 6$

A) $\{ 31 , - 1 \}$
B) { }
C) $\{ \log 31 \} ; \mathrm { x } \approx 1.4914$
D) $\{ 31 \}$