Given that y=ln(7x)y = \ln(7x)y=ln(7x), find dydx\frac{dy}{dx}dxdy. Select the correct option:
A: dydx=1x\frac{dy}{dx} = \frac{1}{x}dxdy=x1
B: dydx=7x\frac{dy}{dx} = \frac{7}{x}dxdy=x7
C: dydx=17x\frac{dy}{dx} = \frac{1}{7x}dxdy=7x1
D: dydx=ln(7)\frac{dy}{dx} = \ln(7)dxdy=ln(7)
