2(2/5k + 1/6) = 3/10k + 2/3
4/5k + 1/3 = 3/10k + 2/3....if u multiply everything by the common denominator, it will get rid of the fractions....so multiply by 30. This, of course, is optional...u can leave the fractions in if u want.
24k + 10 = 9k + 20 (result of multiplying by 30)
24k - 9k = 20 - 10
15k = 10
k = 10/15
k = 2/3 <===
