0
Anonymous
12m + 9n - 4 - 10m + 6n = 2m + 15n - 4
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6n - 4 - 3 = 3n + 10 + 4n -7 = 7n - 6n + 10 -17 = n
6n+3=15 6n+3-3=15-3=12 6n = 12 n=12/6 = 2
6n
Yes.
It is: 3