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(4/5)*u-3 = (-5/3)*u-(7/3) // - (-5/3)*u-(7/3)
(4/5)*u-((-5/3)*u)+7/3-3 = 0
(4/5)*u+(5/3)*u+7/3-3 = 0
37/15*u-2/3 = 0 // + 2/3
37/15*u = 2/3 // : 37/15
u = 2/3/37/15
u = 10/37
u = 10/37
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