[tex]\displaystyle -0,5(5n-6m)+3(1,5n-m)=-2,5n+3m+4,5n-3m=\\(-2,5n+4,5n)+(3m-3m)=2n+0=2n[/tex]
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[tex]\displaystyle -0,5(5n-6m)+3(1,5n-m)=-2,5n+3m+4,5n-3m=\\(-2,5n+4,5n)+(3m-3m)=2n+0=2n[/tex]