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u in (-oo:+oo)
-3/2 = (-2/7)*u-(8/5) // - (-2/7)*u-(8/5)
8/5-((-2/7)*u)-3/2 = 0
(2/7)*u-3/2+8/5 = 0
2/7*u+1/10 = 0 // - 1/10
2/7*u = -1/10 // : 2/7
u = -1/10/2/7
u = -7/20
u = -7/20
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