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arata ca 5 | (x + 2y), atunci 5|(4x +3y) .

Răspuns :

[tex]5~|~5 \Rightarrow 5~|~5(x+y) \Leftrightarrow ~5~|~5x+5y. \\ \\ 5~|~5x+5y~si~5|~x+2y \Rightarrow ~5~|~(5x+5y)-(x+2y) \Leftrightarrow \\ \\ \Leftrightarrow \boxed{5~|~4x+3y }~.[/tex]