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7m=21
m=3
- 13 + 27 = -n + 19 +2n
14=n+19
n=5
3x + 5 = 2x + 12
x=7
4x - 6 = x + 9
3x=15
x=5
5n + 12 = 9n - 16
-4n=-28
n=7
5x - x +6 = -4 + 2x - 8x
4x+6=-4-6x
10x=-10
x=-1