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(7/4)*u-(7/4) = -4*u-(5/3) // + -4*u-(5/3)
(7/4)*u-(-4*u)-(7/4)+5/3 = 0
(7/4)*u+4*u-7/4+5/3 = 0
23/4*u-1/12 = 0 // + 1/12
23/4*u = 1/12 // : 23/4
u = 1/12/23/4
u = 1/69
u = 1/69
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