Answer:
First blank on top of 4 is x.
Second blank under 5x is 8.
Explanation:

We want to find the common denominator so we can combine the fractions on the left.
The common denominator we will go for is 8 since 4(2) is 8 and 8(1)=8.
So I'm going to multiply second fraction by 2/2 giving me:

Now that the denominators are the same we can write the sum as one fraction:

So 3x+2?=5x if ?=x since 3+2=5.
Now *=8 so both sides can have the same denominator.
Test:

Multiply second fraction by 2/2:


