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Rezolvai in N:
b)5(x+1)-7xmai mare decat 3


Răspuns :

[tex]5(x+1)-7x\ \textgreater \ 3\\ 5x+5-7x\ \textgreater \ 3\\ -2x\ \textgreater \ 3-5\\ -2x\ \textgreater \ -2\\ x\ \textless \ 1[/tex]

5(x+1)-7x>3
5x+5-7x>3/-5x
5-2x>3
3+2x>5/-3
2x>2
=>x=2,3,4,5,6,7,8,9,...