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u in (-oo:+oo)
u-((5/4)*u)+3/4 = (-1/3)*(u-(5/3)) // - (-1/3)*(u-(5/3))
u-((-1/3)*(u-(5/3)))-((5/4)*u)+3/4 = 0
(1/3)*(u-5/3)+u+(-5/4)*u+3/4 = 0
1/3*(u-5/3)+u+(-5*u)/4+3/4 = 0
(1/3*4*(u-5/3))/4+(4*u)/4+(-5*u)/4+3/4 = 0
1/3*4*(u-5/3)+4*u-5*u+3 = 0
16/3*u-5*u-20/9+3 = 0
1/3*u-20/9+3 = 0
1/3*u+7/9 = 0
(1/3*u+7/9)/4 = 0
(1/3*u+7/9)/4 = 0 // * 4
1/3*u+7/9 = 0
1/3*u+7/9 = 0 // - 7/9
1/3*u = -7/9 // : 1/3
u = -7/9/1/3
u = -7/3
u = -7/3
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