In the diagram below of triangle G, H, IGHI, JJ is the midpoint of start overline, G, I, end overline GI and KK is the midpoint of start overline, H, I, end overline HI . If J, K, equals, 7, x, plus, 5JK=7x 5, and G, H, equals, 6, x, plus, 18GH=6x 18, what is the measure of start overline, J, K, end overline JK ?