Question 934997
{{{(5k+2)/2k = (20k-4)/(5k+2)}}}
2k(20k-4) = (5k+2)(5k+2) = 25K^2 + 20k + 4
40k^2 - 8k = 25K^2 + 20k + 4
15k^2 - 28k - 4 = 0
{{{x = (28 +- sqrt( 1024 ))/(30) }}}
{{{x = (28 +- 32)/(30) }}}
k = 2, -2/15
and...checking
2k, 5k+2, and 20k-4 
4, 12, 36, ...
-4/15, 4/3, -20/3,...