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