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u in (-oo:+oo)
(3/8)*(14-u) = 6-3*u // - 6-3*u
(3/8)*(14-u)-(-3*u)-6 = 0
(3/8)*(14-u)+3*u-6 = 0
3/8*(14-u)+3*u-6 = 0
3/8*(14-u)+3*u-6 = 0
21/8*u-6+21/4 = 0
21/8*u-3/4 = 0
21/8*u-3/4 = 0
21/8*u-3/4 = 0 // + 3/4
21/8*u = 3/4 // : 21/8
u = 3/4/21/8
u = 2/7
u = 2/7
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