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7m=21/7
m=3
2.n-2n=19+13-27
-n=5/(-1)
n=-5
3. 3x-2x=12-5
x=7
4.4x-x=9+6
3x=15/3
x=5
5.5n-9n=-16-12
4n=-28/4
n=-7
6.4x-2x+8x=-4-6
10x=-10/10
x=-1