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100-((4*u)/3) = 5*u+6/4+6 // - 5*u+6/4+6
100-((4*u)/3)-(5*u)-(6/4)-6 = 0
(-4/3)*u-5*u-3/2-6+100 = 0
185/2-19/3*u = 0 // - 185/2
-19/3*u = -185/2 // : -19/3
u = -185/2/(-19/3)
u = 555/38
u = 555/38
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