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(7/2)*u-5 = (-5/6)*u+5/3 // - (-5/6)*u+5/3
(7/2)*u-((-5/6)*u)-(5/3)-5 = 0
(7/2)*u+(5/6)*u-5/3-5 = 0
13/3*u-20/3 = 0 // + 20/3
13/3*u = 20/3 // : 13/3
u = 20/3/13/3
u = 20/13
u = 20/13
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