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u in (-oo:+oo)
(-3/7)*u-(1/3) = -1/2 // + -1/2
(-3/7)*u-(1/3)-(-1/2) = 0
(-3/7)*u-1/3+1/2 = 0
1/6-3/7*u = 0 // - 1/6
-3/7*u = -1/6 // : -3/7
u = -1/6/(-3/7)
u = 7/18
u = 7/18
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