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