Answer:

The answer should have a <u><em>"POSITIVE SIGN ONLY!"""</em></u>
Step-by-step explanation:
First, you do is switch sides.

Then, you multiply by 5 from both sides.

Finally, you solve and simplify.

<u><em>So, the final answer is x=150.</em></u>
I hope this helps you!
Have a nice day! :)