2m-(-3n+(4n-2(3m-n)+5n))
= 2m-(-3n+(4n-6m-2n+5n))
=2m-(-3n+4n-6m-2n+5n)
=2m+3n-4n+6m+2n-5n
=(2+6)m+(3-4+2-5)n
=8m-4n
=8x(-1/2)-4x(-1)
=-4+4
=0
2m-(-3n+(4n-2(3m-n)+5n))
= 2m-(-3n+(4n-6m-2n+5n))
=2m-(-3n+4n-6m-2n+5n)
=2m+3n-4n+6m+2n-5n
=(2+6)m+(3-4+2-5)n
=8m-4n
=8x(-1/2)-4x(-1)
=-4+4
=0