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(5/4)*u+5/4 = (5/8)*u+4/3 // - (5/8)*u+4/3
(5/4)*u-((5/8)*u)+5/4-(4/3) = 0
(5/4)*u+(-5/8)*u+5/4-4/3 = 0
5/8*u-1/12 = 0 // + 1/12
5/8*u = 1/12 // : 5/8
u = 1/12/5/8
u = 2/15
u = 2/15
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