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u in (-oo:+oo)
1/2-((6/5)*u) = -2/3 // + -2/3
1/2-((6/5)*u)-(-2/3) = 0
(-6/5)*u+1/2+2/3 = 0
7/6-6/5*u = 0 // - 7/6
-6/5*u = -7/6 // : -6/5
u = -7/6/(-6/5)
u = 35/36
u = 35/36
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