8.5.3 Еxample C Consider the equation Aar+b = cx + d, (8.197) where A > 0, a + 0, b+0. (8.198) Making the variable change (--- ad U = -ax (8.199) gives a uA" = R = - A(b- a) (8.200) Therefore, (u= W(Rln A) In A (8.201) and, consequently, W (:)- x = (-) (8.202) a ln A

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