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u in (-oo:+oo)
8*(3/4)*u+8*(9/8) = 8*(7/8)*u-(8*(3/4)) // - 8*(7/8)*u-(8*(3/4))
8*(3/4)*u-(8*(7/8)*u)+8*(9/8)+8*(3/4) = 0
8*(3/4)*u-7*u+8*(9/8)+8*(3/4) = 0
15-u = 0 // - 15
-u = -15 // * -1
u = 15
u = 15
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