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u in (-oo:+oo)
(1/2)*u-(4/3) = -7/5 // + -7/5
(1/2)*u-(4/3)-(-7/5) = 0
(1/2)*u-4/3+7/5 = 0
1/2*u+1/15 = 0 // - 1/15
1/2*u = -1/15 // : 1/2
u = -1/15/1/2
u = -2/15
u = -2/15
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