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We study the sums  $\sum_{n\le X, (n,q)=1}\frac{\mu(n)}{n^s}\log^k\left(\frac{X}{n}\right)$,where $k\in\{0,1\}$,  $s\in\mathbb{C}$, $\Re s>0$ and give asymptotic estimations in an explicitmanner. In order to do so, we produce a large  family of arithmetical identities and derive several applications. Alongsimilar ideas, we present an appendix showing the inequality $\sum_{n\le  X}\Lambda(n)/n\le \log X$, valid for any $X\geq 1$.

M\"obius function and primes: an identity factory with applications