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