Wright an equation that involves multiplication contains a variable and has a solution of 5

You need a solution of 5, so x must equal 5. I will put x as (5) for now.

(5) = 5

You need multiplication, so multiply both sides by the same thing.

2 (5) = 5*2

2 (5) = 10

Now let's substitute 5 back in for x

2x = 10

Of course you can have a different equation by multiplying both sides by something different.