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u in (-oo:+oo)
(1/4)*(3*u-13) = 2-u // - 2-u
(1/4)*(3*u-13)+u-2 = 0
1/4*(3*u-13)+u-2 = 0
1/4*(3*u-13)+u-2 = 0
7/4*u-13/4-2 = 0
7/4*u-21/4 = 0
7/4*u-21/4 = 0
7/4*u-21/4 = 0 // + 21/4
7/4*u = 21/4 // : 7/4
u = 21/4/7/4
u = 3
u = 3
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