Solve the Exponential Equation $$7 ^ { x } = 6 ^ { x + 7 }$$

Multiple Choice

Solve the exponential equation. Express the solution set in terms of natural logarithms.
- $$7 ^ { x } = 6 ^ { x + 7 }$$

A) $81.36$
B) $3.36$
C) $42.00$
D) $40.68$