How do you solve for x?
6 3
= __
x+2 4

It's 6 because if you simplify 6 over 8 you get 3 over 4 because half of 6 is 3 and half of 8 is 4

You can cross multiply to get an equivalent statement:

6 * 4 = 3 * (x + 2)

Then solve for x

You can see that it is indeed an equivalent statement by using a common example:

1/2 = 2/4 --> 1 * 4 = 2 * 2