2(7m-3n)-(8m-5n)去括号再合并同类项,

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2(7m-3n)-(8m-5n)去括号再合并同类项,

2(7m-3n)-(8m-5n)去括号再合并同类项,
2(7m-3n)-(8m-5n)去括号再合并同类项,

2(7m-3n)-(8m-5n)去括号再合并同类项,
2(7m-3n)-(8m-5n)
=14m-6n-8m+5n
=6m-n