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u in (-oo:+oo)
-9*(-1/3) = -3*(-1/3)*u // + -3*(-1/3)*u
-(-3*(-1/3)*u)-9*(-1/3) = 0
-u-9*(-1/3) = 0
3-u = 0 // - 3
-u = -3 // * -1
u = 3
u = 3
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