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(1/2)*u-(4/5) = -2/3 // + -2/3
(1/2)*u-(4/5)-(-2/3) = 0
(1/2)*u-4/5+2/3 = 0
1/2*u-2/15 = 0 // + 2/15
1/2*u = 2/15 // : 1/2
u = 2/15/1/2
u = 4/15
u = 4/15
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