So i solved a few of the steps but i'm stuck at this one step and can't move on

Find y if

y=(10x+9)^10x+1

Note:The product of two numbers or two expressions should be entered asa*b. For the quotient of two numbers usea/b. For the power usea^b.

1.Take the natural logarithm of both sides:

lny = ln(10*x+9)^(10*x+1)

2.Simplify by using properties of logarithms:

Important!In your answer, lna must be entered as log(a).

lny =(10*x+1)*log(10*x+9)

3.Differentiate both sides with respect tox:

yy = (Help please)

4.Solve for y:

y = y( )

5.Substitute the original expression for y to get y in terms ofxonly:

y =

If someone could help me from 3 onwards i would really appreciate it.

Thanks