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Existence of a measure

Let $(X,\mathfrak{B})$ be a measurable space. Could someone give me the steps to show that if $\mu$ and $\nu$ are measures on $\mathfrak{B}$ and $\mu\geqslant \nu$, then there exist a measure, say, $\alpha$ on $\mathfrak{B}$ such that $\mu = \nu +\alpha$.

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