To arrive into the final equation 8j-3k, we must multiply
both sides of the original equation with the least common denominator (lcd) of the two
fractions.
In this case, the lcd is 12. Multiplying that to both
sides will result in:
(2/3j - 1/4k = 5/2) *12
(2/3j)*12 – (1/4k)*12 = (5/2)*12
8j – 3k = 30
