if your question is:
[tex] \frac{4j - 2}{2} = 4j + 5[/tex]
then this is the answer:
[tex] \frac{4j - 2}{2} \times 2 = 2 \times (4j + 5)[/tex]
[tex]4j - 2 = 8j + 10[/tex]
4j - 2 - 4j = 8j + 10 - 4j
-2 = 4j + 10
-2 - 10 = 4j + 10 - 10
-12 = 4j
[tex] \frac{ - 12}{4} = \frac{4j}{4} [/tex]
-3 = j
j = -3
