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9*u+2/5 = 3*u+7/7+9 // - 3*u+7/7+9
9*u-(3*u)+2/5-(7/7)-9 = 0
9*u-3*u+2/5-9-1 = 0
6*u-48/5 = 0 // + 48/5
6*u = 48/5 // : 6
u = 48/5/6
u = 8/5
u = 8/5
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