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u in (-oo:+oo)
(1/4)*u-(3/7) = (2/7)*u-(1/4) // - (2/7)*u-(1/4)
(1/4)*u-((2/7)*u)-(3/7)+1/4 = 0
(1/4)*u+(-2/7)*u-3/7+1/4 = 0
-1/28*u-5/28 = 0 // + 5/28
-1/28*u = 5/28 // : -1/28
u = 5/28/(-1/28)
u = -5
u = -5
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