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u in (-oo:+oo)
(-4/5)*u-4 = (7/2)*u+1/2 // - (7/2)*u+1/2
(-4/5)*u-((7/2)*u)-(1/2)-4 = 0
(-4/5)*u+(-7/2)*u-1/2-4 = 0
-43/10*u-9/2 = 0 // + 9/2
-43/10*u = 9/2 // : -43/10
u = 9/2/(-43/10)
u = -45/43
u = -45/43
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