6m + 15 = 12
Subtract 15 from both sides: 6m = -3
Divide both sides by 6: m = -3/6 = -1/2
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6m + 20 = 9m - 4 24 = 3m m = 8
n - 6m = 8 n = 6m + 8
-1
6m + 7 - 2m + 1 = 4m + 8 If you meant: (6m + 7) - (2m + 1) = 4m + 6
-7 + 4 = -3. So -3 = 6m - 5. Add 5 to both sides of the equation and you get 2 = 6m. Divide both sides of the equation by 6 and you get 2/6 = m. This simplified to, m = 1/3.