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(7/3)*u-4 = (-1/6)*u-(7/2) // - (-1/6)*u-(7/2)
(7/3)*u-((-1/6)*u)+7/2-4 = 0
(7/3)*u+(1/6)*u+7/2-4 = 0
5/2*u-1/2 = 0 // + 1/2
5/2*u = 1/2 // : 5/2
u = 1/2/5/2
u = 1/5
u = 1/5
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