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u in (-oo:+oo)
(-5/2)*u-5 = (4/3)*u-(2/5) // - (4/3)*u-(2/5)
(-5/2)*u-((4/3)*u)+2/5-5 = 0
(-5/2)*u+(-4/3)*u+2/5-5 = 0
-23/6*u-23/5 = 0 // + 23/5
-23/6*u = 23/5 // : -23/6
u = 23/5/(-23/6)
u = -6/5
u = -6/5
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