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Name: Kelsey
Age: 22
I can sing and dance. I can play the violin and the piano, but I can't play the guitar.
Name: Paul
Age: 13
I can sing, but I can't dance. I can play the trumpet and the guitar but I can't play the violin.
已知过点A(-2,m)和B(m,4)的直线与直线2x+y-1=0平行,则m的值为( )