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u in (-oo:+oo)
(-1/5)*u-(5/2) = -4/3 // + -4/3
(-1/5)*u-(5/2)-(-4/3) = 0
(-1/5)*u-5/2+4/3 = 0
-1/5*u-7/6 = 0 // + 7/6
-1/5*u = 7/6 // : -1/5
u = 7/6/(-1/5)
u = -35/6
u = -35/6
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