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u in (-oo:+oo)
-4*(-1/4)*u = 12*(-1/4) // - 12*(-1/4)
-4*(-1/4)*u-(12*(-1/4)) = 0
3-4*(-1/4)*u = 0
u+3 = 0 // - 3
u = -3
u = -3
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