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(1/4)*u-7 = (-2/3)*u-(7/4) // - (-2/3)*u-(7/4)
(1/4)*u-((-2/3)*u)+7/4-7 = 0
(1/4)*u+(2/3)*u+7/4-7 = 0
11/12*u-21/4 = 0 // + 21/4
11/12*u = 21/4 // : 11/12
u = 21/4/11/12
u = 63/11
u = 63/11
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