We want to solve the following expressions

To solve the first expression

We can start by dividing both sides by 10.

Using the following property

If we use both sides of our expression as exponents for a base 2 exponential, we can rewrite our expression as

And this is the answer for the first expression. x = 4.
Solving the second expression

We can start by dividing both sides by 25.

We can apply the natural log on both sides of our expression

Using the following property

We can rewrite our expression as

Dividing both sides by 4, we have

We can simplify this expression by using the following properties

Simplifying our expression, we have

Using a calculator, we have

x = -0.40.