-3
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4m+9+5m-12=42 9m=45 m=5
m + 9 = 2 Therefore, m = 2 - 9 m = -7
4m + 9 + 5m - 12 = 42 9m -3 = 42 9m = 42 + 3 9m = 45 m = 5
M = 5 * * * * * 4m + m - 11 = 9 or 5m - 11 = 9 so that 5m = 20 and then m = 4, NOT 5.
If: 9m=108 m=12 (I divided each side by 9 to isolate 'm').