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u in (-oo:+oo)
(1/4)*u-(7/2) = 3 // - 3
(1/4)*u-(7/2)-3 = 0
(1/4)*u-7/2-3 = 0
1/4*u-13/2 = 0 // + 13/2
1/4*u = 13/2 // : 1/4
u = 13/2/1/4
u = 26
u = 26
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