Respuesta :

[tex]\bf \textit{Logarithm Cancellation Rules}\\\\ \boxed{log_a a^x= x}\qquad \qquad a^{log_ax}=x\\\\ -------------------------------\\\\ e^{ln(7x)}\implies e^{log_e(7x)}\implies 7x[/tex]
The Answer is C.) 7x 
Just took the test!