Hello! :)
Answer:

*The answer must have a <u><em>POSITIVE</em></u> sign!*
Step-by-step explanation:
First, you switch sides of an equation.

Then, you add by 3 from both sides of an equation.

Add by the number from left/right.


Multiply by 5 both sides.

Multiply by the numbers.
8*5=40
x=40
Hope this helps!