已知3n-2m-1=0,求,(1)6n-4m的值;(2)(m+n)-(3m-2n-7)的值

3n-2m-1=0 得：3n-2m=1
1、6n-4m=2(3n-2m)=2x1=2
2、(m+n)-(3m-2n-7)
=m+n-3m+2n+7
=3n-2m+7
=1+7
=8