I think I get it:
So basically 5(2j + 3 + j) multiply any number each by this, for example x 6
So basically: 5x4= 20 2j x 4= 8j 3x4= 12
and the last number is 4 because each number is multiplied by 4.
then you put them together as the same but different numbers,
then it is equivalent
Answer is: 20(8j + 12 + 4j)
twenty times the quantity of eight j plus twelve plus four j
Hope this helps!!