En resumen

Mx + nm = nx - 1 m(x + n) = nx - 1 x + n = (nx - 1) / m x + n = mnx - m x + n + m = mnx.

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GCocacola
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Mx + nm = nx - 1

m(x + n) = nx - 1

x + n = (nx - 1) / m

x + n = mnx - m

x + n + m = mnx.