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u in (-oo:+oo)
12 = (-2/3)*u // - (-2/3)*u
12-((-2/3)*u) = 0
(2/3)*u+12 = 0
2/3*u+12 = 0 // - 12
2/3*u = -12 // : 2/3
u = -12/2/3
u = -18
u = -18
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