(6,5 - 1,3х )*4\13=(0,8-3х):6\7
(6.5 -1.3X)*4*6 = (0,8 - 3X)*7*13
(6.5-1.3X)* 24 = (0.8 - 3X)*91
156 - 31.2X = 72.8 - 273X
241.8X = - 83.2
X = - 0.3440