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u in (-oo:+oo)
-((2/3)*u)-3/2 = -4/5 // + -4/5
-((2/3)*u)-3/2-(-4/5) = 0
(-2/3)*u-3/2+4/5 = 0
-2/3*u-7/10 = 0 // + 7/10
-2/3*u = 7/10 // : -2/3
u = 7/10/(-2/3)
u = -21/20
u = -21/20
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