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u in (-oo:+oo)
(-3/2)*u+3 = (-1/5)*u-(3/2) // - (-1/5)*u-(3/2)
(-3/2)*u-((-1/5)*u)+3/2+3 = 0
(-3/2)*u+(1/5)*u+3/2+3 = 0
9/2-13/10*u = 0 // - 9/2
-13/10*u = -9/2 // : -13/10
u = -9/2/(-13/10)
u = 45/13
u = 45/13
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