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u in (-oo:+oo)
2/3-((2/3)*u) = (-4/5)*u-6 // - (-4/5)*u-6
2/3-((2/3)*u)-((-4/5)*u)+6 = 0
(-2/3)*u+(4/5)*u+2/3+6 = 0
2/15*u+20/3 = 0 // - 20/3
2/15*u = -20/3 // : 2/15
u = -20/3/2/15
u = -50
u = -50
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