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5*u-(5/7) = 3*u-(9/2)+3 // - 3*u-(9/2)+3
5*u-(3*u)-(5/7)+9/2-3 = 0
5*u-3*u-5/7+9/2-3 = 0
2*u+11/14 = 0 // - 11/14
2*u = -11/14 // : 2
u = -11/14/2
u = -11/28
u = -11/28
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