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(2/5)*u-5/2 = -4/3 // + -4/3
(2/5)*u-5/2-(-4/3) = 0
(2/5)*u-5/2+4/3 = 0
2/5*u-7/6 = 0 // + 7/6
2/5*u = 7/6 // : 2/5
u = 7/6/2/5
u = 35/12
u = 35/12
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