Respuesta :

[tex]nx=4j-5x\ \ \ |add\ 5x\ to\ both\ sides\\\\nx+5x=4j\ \ \ |use\ distributive\ property:a(b+c)=ab+ac\\\\x(n+5)=4j\ \ \ |divide\ both\ sides\ by\ (n+5)\neq0\\\\\huge\boxed{x=\frac{4j}{n+5}}[/tex]
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