Solve the Equation $7 ^ { x + 3 } = 49 ^ { 6 }$

Multiple Choice

Solve the equation. Do not use a calculator. $7 ^ { x + 3 } = 49 ^ { 6 }$

A) $x = 1.5$
B) x=3
C) x=6
D) x=9
E) x=15