1) m<n=> 14m<14n
2) m<n=>1/2m<1/2n=>-1/2m>-1/2n
3)m<n=>3m<3n=>3m-7<3n-7
4)m<n=>5m<5n=>0,1+5m<0,1+5n
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Answers & Comments
1) m<n=> 14m<14n
2) m<n=>1/2m<1/2n=>-1/2m>-1/2n
3)m<n=>3m<3n=>3m-7<3n-7
4)m<n=>5m<5n=>0,1+5m<0,1+5n