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(2/3)*u-4 = (-7/4)*u-(5/4) // - (-7/4)*u-(5/4)
(2/3)*u-((-7/4)*u)+5/4-4 = 0
(2/3)*u+(7/4)*u+5/4-4 = 0
29/12*u-11/4 = 0 // + 11/4
29/12*u = 11/4 // : 29/12
u = 11/4/29/12
u = 33/29
u = 33/29
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