T, U, VTUV, WW is the midpoint of start overline, T, V, end overline
TV
and XX is the midpoint of start overline, U, V, end overline
UV
. If W, X, equals, minus, 9, plus, 4, xWX=−9+4x, and T, U, equals, minus, 10, plus, 6, xTU=−10+6x, what is the measure of start overline, W, X, end overline
WX
?